Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol
This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular m...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Chu, Xing [verfasserIn] |
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| Format: |
E-Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2016transfer abstract |
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| Schlagwörter: |
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| Umfang: |
11 |
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| Übergeordnetes Werk: |
Enthalten in: Impact of North Atlantic-East Asian teleconnections on extremely high January PM - Kim, Jeong-Hun ELSEVIER, 2021, the official journal of the International Zeolite Association, Amsterdam [u.a.] |
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| Übergeordnetes Werk: |
volume:230 ; year:2016 ; pages:166-176 ; extent:11 |
| Links: |
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| DOI / URN: |
10.1016/j.micromeso.2016.05.010 |
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ELV01908370X |
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| 245 | 1 | 0 | |a Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol |
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| 520 | |a This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. | ||
| 520 | |a This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. | ||
| 650 | 7 | |a Heterogeneous catalysis |2 Elsevier | |
| 650 | 7 | |a Porous materials |2 Elsevier | |
| 650 | 7 | |a Solid Lewis acidic catalyst |2 Elsevier | |
| 650 | 7 | |a MCM-41 |2 Elsevier | |
| 650 | 7 | |a Prins condensation |2 Elsevier | |
| 700 | 1 | |a Zhou, Dan |4 oth | |
| 700 | 1 | |a Li, Dan |4 oth | |
| 700 | 1 | |a Xia, Kun |4 oth | |
| 700 | 1 | |a Gan, Ning |4 oth | |
| 700 | 1 | |a Lu, Xinhuan |4 oth | |
| 700 | 1 | |a Nie, Renfeng |4 oth | |
| 700 | 1 | |a Xia, Qinghua |4 oth | |
| 773 | 0 | 8 | |i Enthalten in |n Elsevier |a Kim, Jeong-Hun ELSEVIER |t Impact of North Atlantic-East Asian teleconnections on extremely high January PM |d 2021 |d the official journal of the International Zeolite Association |g Amsterdam [u.a.] |w (DE-627)ELV006778283 |
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10.1016/j.micromeso.2016.05.010 doi GBVA2016003000024.pica (DE-627)ELV01908370X (ELSEVIER)S1387-1811(16)30162-7 DE-627 ger DE-627 rakwb eng 530 530 DE-600 333.7 570 690 VZ BIODIV DE-30 fid 48.00 bkl Chu, Xing verfasserin aut Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol 2016transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. Heterogeneous catalysis Elsevier Porous materials Elsevier Solid Lewis acidic catalyst Elsevier MCM-41 Elsevier Prins condensation Elsevier Zhou, Dan oth Li, Dan oth Xia, Kun oth Gan, Ning oth Lu, Xinhuan oth Nie, Renfeng oth Xia, Qinghua oth Enthalten in Elsevier Kim, Jeong-Hun ELSEVIER Impact of North Atlantic-East Asian teleconnections on extremely high January PM 2021 the official journal of the International Zeolite Association Amsterdam [u.a.] (DE-627)ELV006778283 volume:230 year:2016 pages:166-176 extent:11 https://doi.org/10.1016/j.micromeso.2016.05.010 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA SSG-OPC-FOR 48.00 Land- und Forstwirtschaft: Allgemeines VZ AR 230 2016 166-176 11 045F 530 |
| spelling |
10.1016/j.micromeso.2016.05.010 doi GBVA2016003000024.pica (DE-627)ELV01908370X (ELSEVIER)S1387-1811(16)30162-7 DE-627 ger DE-627 rakwb eng 530 530 DE-600 333.7 570 690 VZ BIODIV DE-30 fid 48.00 bkl Chu, Xing verfasserin aut Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol 2016transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. Heterogeneous catalysis Elsevier Porous materials Elsevier Solid Lewis acidic catalyst Elsevier MCM-41 Elsevier Prins condensation Elsevier Zhou, Dan oth Li, Dan oth Xia, Kun oth Gan, Ning oth Lu, Xinhuan oth Nie, Renfeng oth Xia, Qinghua oth Enthalten in Elsevier Kim, Jeong-Hun ELSEVIER Impact of North Atlantic-East Asian teleconnections on extremely high January PM 2021 the official journal of the International Zeolite Association Amsterdam [u.a.] (DE-627)ELV006778283 volume:230 year:2016 pages:166-176 extent:11 https://doi.org/10.1016/j.micromeso.2016.05.010 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA SSG-OPC-FOR 48.00 Land- und Forstwirtschaft: Allgemeines VZ AR 230 2016 166-176 11 045F 530 |
| allfields_unstemmed |
10.1016/j.micromeso.2016.05.010 doi GBVA2016003000024.pica (DE-627)ELV01908370X (ELSEVIER)S1387-1811(16)30162-7 DE-627 ger DE-627 rakwb eng 530 530 DE-600 333.7 570 690 VZ BIODIV DE-30 fid 48.00 bkl Chu, Xing verfasserin aut Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol 2016transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. Heterogeneous catalysis Elsevier Porous materials Elsevier Solid Lewis acidic catalyst Elsevier MCM-41 Elsevier Prins condensation Elsevier Zhou, Dan oth Li, Dan oth Xia, Kun oth Gan, Ning oth Lu, Xinhuan oth Nie, Renfeng oth Xia, Qinghua oth Enthalten in Elsevier Kim, Jeong-Hun ELSEVIER Impact of North Atlantic-East Asian teleconnections on extremely high January PM 2021 the official journal of the International Zeolite Association Amsterdam [u.a.] (DE-627)ELV006778283 volume:230 year:2016 pages:166-176 extent:11 https://doi.org/10.1016/j.micromeso.2016.05.010 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA SSG-OPC-FOR 48.00 Land- und Forstwirtschaft: Allgemeines VZ AR 230 2016 166-176 11 045F 530 |
| allfieldsGer |
10.1016/j.micromeso.2016.05.010 doi GBVA2016003000024.pica (DE-627)ELV01908370X (ELSEVIER)S1387-1811(16)30162-7 DE-627 ger DE-627 rakwb eng 530 530 DE-600 333.7 570 690 VZ BIODIV DE-30 fid 48.00 bkl Chu, Xing verfasserin aut Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol 2016transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. Heterogeneous catalysis Elsevier Porous materials Elsevier Solid Lewis acidic catalyst Elsevier MCM-41 Elsevier Prins condensation Elsevier Zhou, Dan oth Li, Dan oth Xia, Kun oth Gan, Ning oth Lu, Xinhuan oth Nie, Renfeng oth Xia, Qinghua oth Enthalten in Elsevier Kim, Jeong-Hun ELSEVIER Impact of North Atlantic-East Asian teleconnections on extremely high January PM 2021 the official journal of the International Zeolite Association Amsterdam [u.a.] (DE-627)ELV006778283 volume:230 year:2016 pages:166-176 extent:11 https://doi.org/10.1016/j.micromeso.2016.05.010 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA SSG-OPC-FOR 48.00 Land- und Forstwirtschaft: Allgemeines VZ AR 230 2016 166-176 11 045F 530 |
| allfieldsSound |
10.1016/j.micromeso.2016.05.010 doi GBVA2016003000024.pica (DE-627)ELV01908370X (ELSEVIER)S1387-1811(16)30162-7 DE-627 ger DE-627 rakwb eng 530 530 DE-600 333.7 570 690 VZ BIODIV DE-30 fid 48.00 bkl Chu, Xing verfasserin aut Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol 2016transfer abstract 11 nicht spezifiziert zzz rdacontent nicht spezifiziert z rdamedia nicht spezifiziert zu rdacarrier This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. Heterogeneous catalysis Elsevier Porous materials Elsevier Solid Lewis acidic catalyst Elsevier MCM-41 Elsevier Prins condensation Elsevier Zhou, Dan oth Li, Dan oth Xia, Kun oth Gan, Ning oth Lu, Xinhuan oth Nie, Renfeng oth Xia, Qinghua oth Enthalten in Elsevier Kim, Jeong-Hun ELSEVIER Impact of North Atlantic-East Asian teleconnections on extremely high January PM 2021 the official journal of the International Zeolite Association Amsterdam [u.a.] (DE-627)ELV006778283 volume:230 year:2016 pages:166-176 extent:11 https://doi.org/10.1016/j.micromeso.2016.05.010 Volltext GBV_USEFLAG_U GBV_ELV SYSFLAG_U FID-BIODIV SSG-OLC-PHA SSG-OPC-FOR 48.00 Land- und Forstwirtschaft: Allgemeines VZ AR 230 2016 166-176 11 045F 530 |
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Enthalten in Impact of North Atlantic-East Asian teleconnections on extremely high January PM Amsterdam [u.a.] volume:230 year:2016 pages:166-176 extent:11 |
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Enthalten in Impact of North Atlantic-East Asian teleconnections on extremely high January PM Amsterdam [u.a.] volume:230 year:2016 pages:166-176 extent:11 |
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construction of solely lewis acidic sites on zr-mcm-41 and the catalytic activity for the prins condensation of β-pinene and paraformaldehyde to nopol |
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Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol |
| abstract |
This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. |
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This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. |
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This work has firstly constructed purely Lewis acidic sites on MCM-41 successfully, for which Zr-MCM-41 catalysts with different Zr contents are prepared through the hydrolysis of ZrOCl2 on MCM-41, followed by calcination. Thus-prepared materials possess typical hexagonal mesostructures, irregular morphologies, large surface areas, and large pore sizes, as revealed by XRD, SEM, TEM, N2 adsorption, and DRIFT FTIR. UV–vis, Raman and XPS spectra prove the formation of isolated ▪ species in high dispersion on the surface of MCM-41. NH3-TPD analysis shows that the acid intensity of the catalysts is proportional to the content of Zr, and the acidity of Zr-MCM-41 with the Zr content of <0.5% is very weak. Pyridine-IR spectra show that the surface acidity is mainly consisted of Lewis acidity, and solely Lewis acidic sites are constructed on Zr-MCM-41(550) with a low Zr content < 0.5 wt%. More Lewis acidic sites exposed on the surface of Zr-MCM-41 are considerably important for promoting the titled Prins condensation. |
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Construction of Solely Lewis acidic sites on Zr-MCM-41 and the catalytic activity for the Prins condensation of β-pinene and paraformaldehyde to nopol |
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