Hybrid TiO2-SiO2 organic/inorganic gels as catalysts for olefin epoxidation

Melissa Buechler-Skoda; Rajinder Gill; David Vu; Chau Nguyen; Gustavo Larsen

doi:10.1016/S0926-860X(99)00188-X

Hybrid TiO₂-SiO₂ organic/inorganic gels as catalysts for olefin epoxidation

Melissa Buechler-Skoda, Rajinder Gill, David Vu, Chau Nguyen, Gustavo Larsen

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Hybrid TiO₂-SiO₂ xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO₂-SiO₂ alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.

Original language	English (US)
Pages (from-to)	301-310
Number of pages	10
Journal	Applied Catalysis A: General
Volume	185
Issue number	2
DOIs	https://doi.org/10.1016/S0926-860X(99)00188-X
State	Published - Sep 20 1999

Keywords

Adsorption
Hybrid gels
Olefin epoxidation

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology

Access to Document

10.1016/S0926-860X(99)00188-X

Cite this

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title = "Hybrid TiO2-SiO2 organic/inorganic gels as catalysts for olefin epoxidation",

abstract = "Hybrid TiO2-SiO2 xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO2-SiO2 alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.",

keywords = "Adsorption, Hybrid gels, Olefin epoxidation",

author = "Melissa Buechler-Skoda and Rajinder Gill and David Vu and Chau Nguyen and Gustavo Larsen",

note = "Funding Information: A grant from the National Science Foundation (CTS-9733756) is gratefully acknowledged. We also thank partial support from the state of Nebraska, through a Nebraska Research Initiative grant. ",

year = "1999",

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T1 - Hybrid TiO2-SiO2 organic/inorganic gels as catalysts for olefin epoxidation

AU - Buechler-Skoda, Melissa

AU - Gill, Rajinder

AU - Vu, David

AU - Nguyen, Chau

AU - Larsen, Gustavo

N1 - Funding Information: A grant from the National Science Foundation (CTS-9733756) is gratefully acknowledged. We also thank partial support from the state of Nebraska, through a Nebraska Research Initiative grant.

PY - 1999/9/20

Y1 - 1999/9/20

N2 - Hybrid TiO2-SiO2 xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO2-SiO2 alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.

AB - Hybrid TiO2-SiO2 xerogels were treated at different temperatures, and used as olefin epoxidation catalysts. All samples displayed a very high selectivity toward formation of cyclooctene oxide from cis-cyclooctene, in the presence of hydrogen peroxide and methanol. 'All-inorganic' (entirely TEOS-based) preparations are more subject to Ti leaching during reaction than the hybrid materials and as a consequence, they display much poorer activity recovery after recovery and re-use. The higher hydrophobicity of the hybrid samples relative to that of the conventional TiO2-SiO2 alcogel is demonstrated by dynamic adsorption experiments using an oscillating balance reactor.

KW - Adsorption

KW - Hybrid gels

KW - Olefin epoxidation

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