Titania–silica epoxidation catalysts modified by acetoxypropyl groups
Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hy...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Müller, C.A. [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2000 |
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| Systematik: |
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| Anmerkung: |
© Kluwer Academic Publishers 2000 |
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| Übergeordnetes Werk: |
Enthalten in: Catalysis letters - Kluwer Academic Publishers-Plenum Publishers, 1988, 64(2000), 1 vom: Jan., Seite 9-14 |
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| Übergeordnetes Werk: |
volume:64 ; year:2000 ; number:1 ; month:01 ; pages:9-14 |
| Links: |
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| DOI / URN: |
10.1023/A:1019074617565 |
|---|
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OLC2040146261 |
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| 520 | |a Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. | ||
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| 700 | 1 | |a Baiker, A. |4 aut | |
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10.1023/A:1019074617565 doi (DE-627)OLC2040146261 (DE-He213)A:1019074617565-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Müller, C.A. verfasserin aut Titania–silica epoxidation catalysts modified by acetoxypropyl groups 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 2000 Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. Schneider, M. aut Gisler, A. aut Mallat, T. aut Baiker, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers-Plenum Publishers, 1988 64(2000), 1 vom: Jan., Seite 9-14 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:64 year:2000 number:1 month:01 pages:9-14 https://doi.org/10.1023/A:1019074617565 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 VA 2890 AR 64 2000 1 01 9-14 |
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10.1023/A:1019074617565 doi (DE-627)OLC2040146261 (DE-He213)A:1019074617565-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Müller, C.A. verfasserin aut Titania–silica epoxidation catalysts modified by acetoxypropyl groups 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 2000 Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. Schneider, M. aut Gisler, A. aut Mallat, T. aut Baiker, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers-Plenum Publishers, 1988 64(2000), 1 vom: Jan., Seite 9-14 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:64 year:2000 number:1 month:01 pages:9-14 https://doi.org/10.1023/A:1019074617565 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 VA 2890 AR 64 2000 1 01 9-14 |
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10.1023/A:1019074617565 doi (DE-627)OLC2040146261 (DE-He213)A:1019074617565-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Müller, C.A. verfasserin aut Titania–silica epoxidation catalysts modified by acetoxypropyl groups 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 2000 Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. Schneider, M. aut Gisler, A. aut Mallat, T. aut Baiker, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers-Plenum Publishers, 1988 64(2000), 1 vom: Jan., Seite 9-14 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:64 year:2000 number:1 month:01 pages:9-14 https://doi.org/10.1023/A:1019074617565 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 VA 2890 AR 64 2000 1 01 9-14 |
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10.1023/A:1019074617565 doi (DE-627)OLC2040146261 (DE-He213)A:1019074617565-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Müller, C.A. verfasserin aut Titania–silica epoxidation catalysts modified by acetoxypropyl groups 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 2000 Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. Schneider, M. aut Gisler, A. aut Mallat, T. aut Baiker, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers-Plenum Publishers, 1988 64(2000), 1 vom: Jan., Seite 9-14 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:64 year:2000 number:1 month:01 pages:9-14 https://doi.org/10.1023/A:1019074617565 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 VA 2890 AR 64 2000 1 01 9-14 |
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10.1023/A:1019074617565 doi (DE-627)OLC2040146261 (DE-He213)A:1019074617565-p DE-627 ger DE-627 rakwb eng 540 660 VZ VA 2890 VZ rvk Müller, C.A. verfasserin aut Titania–silica epoxidation catalysts modified by acetoxypropyl groups 2000 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © Kluwer Academic Publishers 2000 Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. Schneider, M. aut Gisler, A. aut Mallat, T. aut Baiker, A. aut Enthalten in Catalysis letters Kluwer Academic Publishers-Plenum Publishers, 1988 64(2000), 1 vom: Jan., Seite 9-14 (DE-627)130436550 (DE-600)644234-1 (DE-576)025720724 1011-372X nnns volume:64 year:2000 number:1 month:01 pages:9-14 https://doi.org/10.1023/A:1019074617565 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-TEC SSG-OLC-CHE GBV_ILN_21 GBV_ILN_65 GBV_ILN_70 GBV_ILN_2006 GBV_ILN_2016 GBV_ILN_4012 GBV_ILN_4305 VA 2890 AR 64 2000 1 01 9-14 |
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Müller, C.A. |
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10.1023/A:1019074617565 |
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540 660 |
| title_sort |
titania–silica epoxidation catalysts modified by acetoxypropyl groups |
| title_auth |
Titania–silica epoxidation catalysts modified by acetoxypropyl groups |
| abstract |
Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. © Kluwer Academic Publishers 2000 |
| abstractGer |
Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. © Kluwer Academic Publishers 2000 |
| abstract_unstemmed |
Abstract Mesoporous titania–silica aerogels with $ TiO_{2} $$ SiO_{2} $ = 1:9 weight ratio and varying amounts of covalently bound 3‐acetoxypropyl groups were prepared from 3‐acetoxypropyltrimethoxysilane, tetramethoxysilane and titanbisacetylacetonatdiisopropoxide. The textural properties of the hybrid aerogels were strongly influenced by the concentration of acetoxypropyl groups. The BET surface area and specific pore volume were significantly lowered upon introduction of the polar organic modification. Despite these less favorable textural properties, all modified aerogels were remarkably more active epoxidation catalysts, and in the epoxidation of cyclohexenol also more selective, than the unmodified titania–silica aerogel. For example, incorporation of only 2 mol% acetoxypropyl groups lowered the BET surface area from 813 to 339 $ m^{2} $ $ g^{-1} $, whereas the selectivity to 2,3‐epoxy‐cyclohexenol increased from 76 to 90%, and the reaction time (required to achieve 70% TBHP conversion) decreased from 46 to 5 min. The higher epoxide selectivity and the small enhancement in cis/trans ratio in the epoxide may indicate an electron pair donor interaction between the ester carbonyl group and the Ti active site. © Kluwer Academic Publishers 2000 |
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Titania–silica epoxidation catalysts modified by acetoxypropyl groups |
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Schneider, M. Gisler, A. Mallat, T. Baiker, A. |
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