SiO2–TiO2 prepared by innovative sol-gel routes: towards efficient epoxidation catalysts for bulky olefins
(2019) 14th European Congress on Catalysis (EuropaCat 2019) — Location: Aachen, Germany (18.August.2019)
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- Authors
Smeets, Valentin 
- Abstract
- The simultaneous control over texture and active site speciation is an important challenge in catalysis. The titanosilicalite-1 (TS-1) zeolite is a good illustration. This microporous crystalline material shows very high Ti dispersion and high performance e.g. in olefin epoxidation. However, its use in industrial applications is limited to lower olefins as the microporosity strongly hampers the diffusion of the reactants and products in and out the pores. Besides, the framework Ti content is limited to 2.5 mol. %. There are therefore strong incentives to find new titanosilicate catalysts, combining large pores and high Ti loading and dispersion, in order to extend the versatility of epoxidation catalysts to larger olefins (e.g. cyclohexene). However, these solids are often amorphous, bringing an additional challenge in order to stabilize the active species in the presence of water. Also, the catalysts are often obtained in the form of small powders, requiring further steps to shape the materials before they could be used in flow processes. Herein, we present three examples of sol-gel strategies which successfully address the above-mentioned challenges.
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Citations
Smeets, V., Gaigneaux, E., & Debecker, D. (2019). SiO2–TiO2 prepared by innovative sol-gel routes: towards efficient epoxidation catalysts for bulky olefins. 14th European Congress on Catalysis (EuropaCat 2019), Aachen, Germany. https://hdl.handle.net/2078.5/61750