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Titania-silica aerogels with superior catalytic performance in olefin epoxidation compared to large pore Ti-molecular sieves

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Abstract

The paper provides a short overview on the various Ti- and Si-containing epoxidation catalysts, with a focus on the development and characterisation of titania-silica mixed oxides prepared by the sol-gel-aerogel method. Titania-silica aerogels, dried by semicontinuous extraction of the solvent with supercritical CO2 at low temperature, possess high surface area, an amorphous mesoporous structure, and a rather even distribution of Ti in the silica matrix. The catalytic activities of mixed oxides, silica-supported titania and Ti-substituted molecular sieves (TS-1, Ti-Β and Ti-MCM-41) are compared in the epoxidation of 1-hexene, 1-octene, cyclohexene, cyclododecene and norbornene, based on literature data. The activities (i.e. the amount of converted olefin per unit time and catalyst weight) vary in a broad range of several orders of magnitude. It is shown that the low temperature aerogel containing 20 wt% TiO2 is superior to any other Ti- and Si-containing catalyst for the epoxidation of cyclic olefins. In the epoxidation of linear alkenes TS-1 has outstanding activity. Ti-substituted large and ultra-large pore molecular sieves require further development concerning their catalytic performance.

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Authors and Affiliations

  1. Department of Chemical Engineering and Industrial Chemistry, Swiss Federal Institute of Technology, ETH-Zentrum, CH-8092, Zurich, Switzerland

    R. Hutter, T. Mallat, D. Dutoit & A. Baiker

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  1. R. Hutter
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  2. T. Mallat
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  3. D. Dutoit
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  4. A. Baiker
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Hutter, R., Mallat, T., Dutoit, D. et al. Titania-silica aerogels with superior catalytic performance in olefin epoxidation compared to large pore Ti-molecular sieves. Top Catal 3, 421–436 (1996). https://doi.org/10.1007/BF02113865

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