Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures : = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen

Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Helten, Oliver [verfasserIn] Ostertag-Henning, Christian [akademischer betreuerIn] Hinrichs, Kai-Uwe - 1963- [akademischer betreuerIn] Seewald, Jeffrey [akademischer betreuerIn]
Körperschaften:	Universität Bremen [Grad-verleihende Institution]
Hochschulschrift:	Dissertation ; Universität Bremen ; 2024

Format:	E-Book
Sprache:	Englisch

Erschienen:	Bremen: 2023

Rechteinformationen:	Open Access Namensnennung 4.0 International ; CC BY 4.0

Schlagwörter:	acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption
Formangabe:	Hochschulschrift

Umfang:	1 Online-Ressource (VIII, 172 Seiten) ; Illustrationen

Weitere Ausgabe:	Erscheint auch als Druck-Ausgabe Helten, Oliver: Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures - Bremen, 2023

Links:	Link aufrufen Link aufrufen Link aufrufen Link aufrufen Link aufrufen

DOI / URN:	urn:nbn:de:gbv:46-elib80176 10.26092/elib/3051

Katalog-ID:	1895439965

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topic_title	553.6 DE-101 550 DE-101 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption
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title_full	Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten
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title_sub	= Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen
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title_sort	generation of gases and low-molecular-weight organic acids in opalinus clay at elevated temperatures = bildung von gasen und kurzkettigen organischen säuren in opalinuston bei erhöhten temperaturen
title_auth	Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen
abstract	Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay.
abstractGer	Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay.
abstract_unstemmed	Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay.
url	https://doi.org/10.26092/elib/3051 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 https://d-nb.info/133951267X/34 https://media.suub.uni-bremen.de/handle/elib/8017
author2	Ostertag-Henning, Christian Hinrichs, Kai-Uwe 1963- Seewald, Jeffrey Universität Bremen
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allfields	urn:nbn:de:gbv:46-elib80176 urn 10.26092/elib/3051 doi (DE-627)1895439965 (DE-599)KXP1895439965 (OCoLC)1446198300 (OAEPFHB)elib/3051 DE-627 ger DE-627 rda eng XA-DE-HB 553.6 DE-101 550 DE-101 Helten, Oliver verfasserin (orcid)0000-0002-7868-5746 aut Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen Bremen 2023 1 Online-Ressource (VIII, 172 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2024 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB pdager DE-46 acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Ostertag-Henning, Christian akademischer betreuerin dgs Hinrichs, Kai-Uwe 1963- akademischer betreuerin (DE-588)115523677 (DE-627)077305647 (DE-576)289929768 dgs Seewald, Jeffrey akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Helten, Oliver Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures Bremen, 2023 VIII, 172 Seiten (DE-627)1895440114 https://doi.org/10.26092/elib/3051 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 Resolving-System kostenfrei https://d-nb.info/133951267X/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/8017 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593084032 x 12-10-24 21 01 0046 4551143618 ebook_2024_dissbremen Kostenloser Zugriff zza 15-07-24 22 01 0018 4593185149 SUBolrd xu 12-10-24 23 01 0830 459323302X olr-d x 12-10-24 30 01 0104 4593279496 z 12-10-24 40 01 0007 4593316049 xsn 12-10-24 60 01 0705 4593374189 OLRD z 12-10-24 63 01 3401 4593427355 ORD x 12-10-24 70 01 0089 4593483190 z 12-10-24 105 01 0841 4593872553 z 12-10-24 110 01 3110 4593583594 x 12-10-24 132 01 0959 4593627230 OLR-DISS x 12-10-24 151 01 0546 4593667836 OLR-ODISS z 12-10-24 161 01 0960 4593691877 ORD z 12-10-24 293 01 3293 4593821452 ORD z 12-10-24 370 01 4370 4593854768 x 12-10-24 2403 01 DE-LFER 4565437511 00 --%%-- --%%-- n --%%-- l01 12-08-24 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 21 01 0046 https://doi.org/10.26092/elib/3051 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 2403 01 DE-LFER https://doi.org/10.26092/elib/3051 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2024_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16
spelling	urn:nbn:de:gbv:46-elib80176 urn 10.26092/elib/3051 doi (DE-627)1895439965 (DE-599)KXP1895439965 (OCoLC)1446198300 (OAEPFHB)elib/3051 DE-627 ger DE-627 rda eng XA-DE-HB 553.6 DE-101 550 DE-101 Helten, Oliver verfasserin (orcid)0000-0002-7868-5746 aut Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen Bremen 2023 1 Online-Ressource (VIII, 172 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2024 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB pdager DE-46 acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Ostertag-Henning, Christian akademischer betreuerin dgs Hinrichs, Kai-Uwe 1963- akademischer betreuerin (DE-588)115523677 (DE-627)077305647 (DE-576)289929768 dgs Seewald, Jeffrey akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Helten, Oliver Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures Bremen, 2023 VIII, 172 Seiten (DE-627)1895440114 https://doi.org/10.26092/elib/3051 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 Resolving-System kostenfrei https://d-nb.info/133951267X/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/8017 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593084032 x 12-10-24 21 01 0046 4551143618 ebook_2024_dissbremen Kostenloser Zugriff zza 15-07-24 22 01 0018 4593185149 SUBolrd xu 12-10-24 23 01 0830 459323302X olr-d x 12-10-24 30 01 0104 4593279496 z 12-10-24 40 01 0007 4593316049 xsn 12-10-24 60 01 0705 4593374189 OLRD z 12-10-24 63 01 3401 4593427355 ORD x 12-10-24 70 01 0089 4593483190 z 12-10-24 105 01 0841 4593872553 z 12-10-24 110 01 3110 4593583594 x 12-10-24 132 01 0959 4593627230 OLR-DISS x 12-10-24 151 01 0546 4593667836 OLR-ODISS z 12-10-24 161 01 0960 4593691877 ORD z 12-10-24 293 01 3293 4593821452 ORD z 12-10-24 370 01 4370 4593854768 x 12-10-24 2403 01 DE-LFER 4565437511 00 --%%-- --%%-- n --%%-- l01 12-08-24 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 21 01 0046 https://doi.org/10.26092/elib/3051 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 2403 01 DE-LFER https://doi.org/10.26092/elib/3051 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2024_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16
allfields_unstemmed	urn:nbn:de:gbv:46-elib80176 urn 10.26092/elib/3051 doi (DE-627)1895439965 (DE-599)KXP1895439965 (OCoLC)1446198300 (OAEPFHB)elib/3051 DE-627 ger DE-627 rda eng XA-DE-HB 553.6 DE-101 550 DE-101 Helten, Oliver verfasserin (orcid)0000-0002-7868-5746 aut Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen Bremen 2023 1 Online-Ressource (VIII, 172 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2024 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB pdager DE-46 acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Ostertag-Henning, Christian akademischer betreuerin dgs Hinrichs, Kai-Uwe 1963- akademischer betreuerin (DE-588)115523677 (DE-627)077305647 (DE-576)289929768 dgs Seewald, Jeffrey akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Helten, Oliver Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures Bremen, 2023 VIII, 172 Seiten (DE-627)1895440114 https://doi.org/10.26092/elib/3051 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 Resolving-System kostenfrei https://d-nb.info/133951267X/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/8017 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593084032 x 12-10-24 21 01 0046 4551143618 ebook_2024_dissbremen Kostenloser Zugriff zza 15-07-24 22 01 0018 4593185149 SUBolrd xu 12-10-24 23 01 0830 459323302X olr-d x 12-10-24 30 01 0104 4593279496 z 12-10-24 40 01 0007 4593316049 xsn 12-10-24 60 01 0705 4593374189 OLRD z 12-10-24 63 01 3401 4593427355 ORD x 12-10-24 70 01 0089 4593483190 z 12-10-24 105 01 0841 4593872553 z 12-10-24 110 01 3110 4593583594 x 12-10-24 132 01 0959 4593627230 OLR-DISS x 12-10-24 151 01 0546 4593667836 OLR-ODISS z 12-10-24 161 01 0960 4593691877 ORD z 12-10-24 293 01 3293 4593821452 ORD z 12-10-24 370 01 4370 4593854768 x 12-10-24 2403 01 DE-LFER 4565437511 00 --%%-- --%%-- n --%%-- l01 12-08-24 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 21 01 0046 https://doi.org/10.26092/elib/3051 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 2403 01 DE-LFER https://doi.org/10.26092/elib/3051 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2024_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16
allfieldsGer	urn:nbn:de:gbv:46-elib80176 urn 10.26092/elib/3051 doi (DE-627)1895439965 (DE-599)KXP1895439965 (OCoLC)1446198300 (OAEPFHB)elib/3051 DE-627 ger DE-627 rda eng XA-DE-HB 553.6 DE-101 550 DE-101 Helten, Oliver verfasserin (orcid)0000-0002-7868-5746 aut Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen Bremen 2023 1 Online-Ressource (VIII, 172 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2024 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB pdager DE-46 acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Ostertag-Henning, Christian akademischer betreuerin dgs Hinrichs, Kai-Uwe 1963- akademischer betreuerin (DE-588)115523677 (DE-627)077305647 (DE-576)289929768 dgs Seewald, Jeffrey akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Helten, Oliver Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures Bremen, 2023 VIII, 172 Seiten (DE-627)1895440114 https://doi.org/10.26092/elib/3051 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 Resolving-System kostenfrei https://d-nb.info/133951267X/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/8017 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593084032 x 12-10-24 21 01 0046 4551143618 ebook_2024_dissbremen Kostenloser Zugriff zza 15-07-24 22 01 0018 4593185149 SUBolrd xu 12-10-24 23 01 0830 459323302X olr-d x 12-10-24 30 01 0104 4593279496 z 12-10-24 40 01 0007 4593316049 xsn 12-10-24 60 01 0705 4593374189 OLRD z 12-10-24 63 01 3401 4593427355 ORD x 12-10-24 70 01 0089 4593483190 z 12-10-24 105 01 0841 4593872553 z 12-10-24 110 01 3110 4593583594 x 12-10-24 132 01 0959 4593627230 OLR-DISS x 12-10-24 151 01 0546 4593667836 OLR-ODISS z 12-10-24 161 01 0960 4593691877 ORD z 12-10-24 293 01 3293 4593821452 ORD z 12-10-24 370 01 4370 4593854768 x 12-10-24 2403 01 DE-LFER 4565437511 00 --%%-- --%%-- n --%%-- l01 12-08-24 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 21 01 0046 https://doi.org/10.26092/elib/3051 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 2403 01 DE-LFER https://doi.org/10.26092/elib/3051 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2024_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16
allfieldsSound	urn:nbn:de:gbv:46-elib80176 urn 10.26092/elib/3051 doi (DE-627)1895439965 (DE-599)KXP1895439965 (OCoLC)1446198300 (OAEPFHB)elib/3051 DE-627 ger DE-627 rda eng XA-DE-HB 553.6 DE-101 550 DE-101 Helten, Oliver verfasserin (orcid)0000-0002-7868-5746 aut Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen vorgelegt von Oliver Helten Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen Bremen 2023 1 Online-Ressource (VIII, 172 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2024 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. It is concluded that the quantities of generated gases and LMWOA, when confronted with geochemical reactions decomposing and/or immobilizing some of them, are unlikely to affect the integrity and long-term safety of a HLW repository in the Opalinus Clay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB pdager DE-46 acetate carbon dioxide claystone complexation formate high-level heat-emitting nuclear waste host rock hydrocarbon gases hydrous pyrolysis isotope mass balance kinetics molecular hydrogen oxalate sorption Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Ostertag-Henning, Christian akademischer betreuerin dgs Hinrichs, Kai-Uwe 1963- akademischer betreuerin (DE-588)115523677 (DE-627)077305647 (DE-576)289929768 dgs Seewald, Jeffrey akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Helten, Oliver Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures Bremen, 2023 VIII, 172 Seiten (DE-627)1895440114 https://doi.org/10.26092/elib/3051 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 Resolving-System kostenfrei https://d-nb.info/133951267X/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/8017 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593084032 x 12-10-24 21 01 0046 4551143618 ebook_2024_dissbremen Kostenloser Zugriff zza 15-07-24 22 01 0018 4593185149 SUBolrd xu 12-10-24 23 01 0830 459323302X olr-d x 12-10-24 30 01 0104 4593279496 z 12-10-24 40 01 0007 4593316049 xsn 12-10-24 60 01 0705 4593374189 OLRD z 12-10-24 63 01 3401 4593427355 ORD x 12-10-24 70 01 0089 4593483190 z 12-10-24 105 01 0841 4593872553 z 12-10-24 110 01 3110 4593583594 x 12-10-24 132 01 0959 4593627230 OLR-DISS x 12-10-24 151 01 0546 4593667836 OLR-ODISS z 12-10-24 161 01 0960 4593691877 ORD z 12-10-24 293 01 3293 4593821452 ORD z 12-10-24 370 01 4370 4593854768 x 12-10-24 2403 01 DE-LFER 4565437511 00 --%%-- --%%-- n --%%-- l01 12-08-24 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 21 01 0046 https://doi.org/10.26092/elib/3051 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib80176 2403 01 DE-LFER https://doi.org/10.26092/elib/3051 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2024_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16
language	English
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authorswithroles_txt_mv	Helten, Oliver @@aut@@ Ostertag-Henning, Christian @@dgs@@ Hinrichs, Kai-Uwe @@dgs@@ Seewald, Jeffrey @@dgs@@
genre_facet	Hochschulschrift
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spellingShingle	Helten, Oliver ddc 553.6 ddc 550 misc acetate misc carbon dioxide misc claystone misc complexation misc formate misc high-level heat-emitting nuclear waste misc host rock misc hydrocarbon gases misc hydrous pyrolysis misc isotope mass balance misc kinetics misc molecular hydrogen misc oxalate misc sorption 21 Universität Bremen 21 Fachbereich 05: Geowissenschaften (FB 05) Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen
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topic	ddc 553.6 ddc 550 misc acetate misc carbon dioxide misc claystone misc complexation misc formate misc high-level heat-emitting nuclear waste misc host rock misc hydrocarbon gases misc hydrous pyrolysis misc isotope mass balance misc kinetics misc molecular hydrogen misc oxalate misc sorption 21 Universität Bremen 21 Fachbereich 05: Geowissenschaften (FB 05)
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topic_browse	ddc 553.6 ddc 550 misc acetate misc carbon dioxide misc claystone misc complexation misc formate misc high-level heat-emitting nuclear waste misc host rock misc hydrocarbon gases misc hydrous pyrolysis misc isotope mass balance misc kinetics misc molecular hydrogen misc oxalate misc sorption 21 Universität Bremen 21 Fachbereich 05: Geowissenschaften (FB 05)
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title	Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen
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physical	1 Online-Ressource (VIII, 172 Seiten) Illustrationen
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title_short	Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures
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title_alt	Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen
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up_date	2024-10-30T06:36:04.677Z
_version_	1814319768200544256
fullrecord_marcxml	<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000cam a2200265 4500</leader><controlfield tag="001">1895439965</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20241029114311.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">240715s2023 gw \|\|\|\|\|om 00\| \|\|eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">urn:nbn:de:gbv:46-elib80176</subfield><subfield code="2">urn</subfield></datafield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.26092/elib/3051</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)1895439965</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)KXP1895439965</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)1446198300</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OAEPFHB)elib/3051</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rda</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="c">XA-DE-HB</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">553.6</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">550</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Helten, Oliver</subfield><subfield code="e">verfasserin</subfield><subfield code="0">(orcid)0000-0002-7868-5746</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures</subfield><subfield code="b"> = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen</subfield><subfield code="c">vorgelegt von Oliver Helten</subfield></datafield><datafield tag="246" ind1="3" ind2="1"><subfield code="a">Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Bremen</subfield><subfield code="c">2023</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">1 Online-Ressource (VIII, 172 Seiten)</subfield><subfield code="b">Illustrationen</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="502" ind1=" " ind2=" "><subfield code="b">Dissertation</subfield><subfield code="c">Universität Bremen</subfield><subfield code="d">2024</subfield></datafield><datafield tag="506" ind1="0" ind2=" "><subfield code="q">DE-46</subfield><subfield code="a">Open Access</subfield><subfield code="e">Controlled Vocabulary for Access Rights</subfield><subfield code="u">http://purl.org/coar/access_right/c_abf2</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Due to their low permeability, high retention capability for radionuclides, and self-sealing of fractures by swelling, claystones have beneficial properties as natural barrier for high-level heat-emitting nuclear waste (HLW). Temperatures at the surface of HLW containers in claystone formations are expected to be in the range of 90–150 °C. Elevated temperatures can cause clay mineral transformation reactions reducing the radionuclide retention potential of the host rock. In this thesis, the thermal transformation of organic matter in a host rock for HLW disposal, the Opalinus Clay (OPA; Mont Terri, St. Ursanne, Switzerland), was investigated in hydrous pyrolysis experiments at temperatures from 80–200 °C – and beyond. Geochemical reactions were monitored over periods of several weeks. The experiments demonstrated the generation of gaseous CO2 and C1–C4 hydrocarbons. CO2(g) was the dominant gas. Gas yields increased with increasing temperature. CO2(g) originated predominantly from the dissolution of carbonate mineral phases in the OPA sample material and, to a lesser extent, from the thermal transformation of OPA organic matter. Analyses of aqueous fluid samples showed the generation of LMWOA, predominantly acetate, followed by oxalate and formate. The yields of the acids increased with increasing temperature, with the exception of significantly lower quantities of oxalate and formate at temperatures ≥160 °C. The application of kinetic data on thermal LMWOA decomposition (e.g., decarboxylation) from the literature demonstrated that simultaneous generation and decomposition reactions of LMWOA affect the prediction of gas generation (e.g., CO2(g) + CH4(g)) by decarboxylation. 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Generation of gases and low-molecular-weight organic acids in Opalinus Clay at elevated temperatures : = Bildung von Gasen und kurzkettigen organischen Säuren in Opalinuston bei erhöhten Temperaturen

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