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Korean Journal of Chemical Engineering, Vol.17, No.1, 76-80, 2000
Epoxidation of n-Hexene and Cyclohexene over Titanium-Containing Catalysts
TS-1, Ti-beta and Ti-MCM-41 molecular sieves have been prepared by direct hydrothermal synthesis method and applied to the epoxidation of n-hexene and cyclohexene with H2O2 under mild conditions. Ti-beta with extremely low Al content was synthesized by using a seed method to suppress the formation of diol produced by Bronsted acid sites present in Ti-beta. It was also found that a large amount of by-products (1-ol and 1-one) formed over hydrophilic Ti-MCM-41. We further modified Ti-MCM-41 by silylation with bis(trimethylsilyl) trifluouroacetamide (BSTFA). Among these catalysts, the Ti-beta with low content of Al enhanced the yield of epoxide and suppressed the formation of diol markedly. The sily lated Ti-MCM-41 reduced the formation of by-products and promoted the yields of epoxide significantly. Based on experimental results, a reaction mechanism with two parallel and competitive reactions was proposed.
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[Cited By]
- Yoon BS, Ahn WS, HWAHAK KONGHAK, 40(1), 1, 2002
- Ban HJ, Lee KY, Lee JK, Chung ST, Ahn WS, Korean Chemical Engineering Research, 44(2), 121, 2006
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- Yang ST, Ban HJ, Kim SY, Ahn WS, Korean Chemical Engineering Research, 46(4), 665, 2008
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