On the limited selectivity of silica-based epoxidation catalysts

Citation
C. Beck et al., On the limited selectivity of silica-based epoxidation catalysts, CATAL LETT, 75(3-4), 2001, pp. 131-136
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics","Chemical Engineering
Journal title
CATALYSIS LETTERS
ISSN journal
1011-372X → ACNP
Volume
75
Issue
3-4
Year of publication
2001
Pages
131 - 136
Database
ISI
SICI code
1011-372X(2001)75:3-4<131:OTLSOS>2.0.ZU;2-5
Abstract
Epoxidation of 2-cyclohexen-1-ol with TBHP and TiO2-SiO2, Fe2O3-SiO2 and Si O2 aerogels has been studied. The influence of surface silanol groups and t ransition metal impurities in titania-silica on the product distribution ha s been analyzed. The results, supported by literature data, indicate that h igh surface area silica cannot generally be regarded as an inert matrix in epoxidation catalysts, Contribution of Ti-free silica limits the selectivit y of Ti- and Si-containing catalysts in demanding epoxidation reactions. Th e activity of silica - together with the background oxidation of the olefin - may lead to overestimated intrinsic activities when the reaction rate is related to the Ti content of the catalyst.