4 years ago

Hierarchical Ti-Beta Obtained by Simultaneous Desilication and Titanation as an Efficient Catalyst for Cyclooctene Epoxidation

Hierarchical Ti-Beta Obtained by Simultaneous Desilication and Titanation as an Efficient Catalyst for Cyclooctene Epoxidation
Steffen Oswald, Lars Giebeler, Paul Bludovsky, Carolin Selzer, Stefan Kaskel, Anja Werner, Ulrike Koch
A novel post-synthesis route to hierarchical Ti-beta zeolite and its performance as an efficient catalyst in heterogeneous cyclooctene epoxidation are presented. Catalytically active Ti sites as well as meso- and macropores are simultaneously introduced into microporous beta zeolite by hydrothermal treatment by using tetrabutyl orthotitanate as the titanation agent and tetraethylammonium hydroxide as the desilication base. Simultaneous desilication and titanation (SDT) offer the advantages of reduced experimental effort and chemical waste. The possibility to use a commercial zeolite available in high quantity as the starting material is attractive for industrialization. A significant mesopore volume (Vmeso=0.19 cm3 g−1) was introduced in the resulting hierarchical Ti-beta zeolite without loss of microporosity and crystallinity compared to the purely microporous counterpart. The comparison clearly demonstrates a higher catalytic activity for the hierarchical Ti-beta in cyclooctene epoxidation and accelerated desorption kinetics associated with the highly interconnected pore system. Holey moly! The introduction of large pores is known to be an efficient method to overcome performance constraints of zeolites caused by diffusional limitations. The substitution of framework atoms with Ti is essential for epoxidation catalysis. Combining both post-synthesis steps provides high-performance epoxidation catalysts particularly for large substrates at significantly reduced cost.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/cctc.201700633

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