544652 Zeolite a Catalysts Reduced By NaBH4 for Hydroformylation of 1-Hexene

Wednesday, June 5, 2019: 3:03 PM
Texas Ballroom EF (Grand Hyatt San Antonio)
Yuan Fang, Guohui Yang, Yoshiharu Yoneyama and Noritatsu Tsubaki, Department of Applied Chemistry, School of Engineering, University of Toyama, Toyama, Japan

Zeolite A catalysts reduced by NaBH4 for hydroformylation of 1-hexene

Yuan Fang, Guohui Yang, Yoshiharu Yoneyama, Noritatsu Tsubaki*

Department of Applied Chemistry, School of Engineering, University of Toyama, Toyama, 930-8555, Japan

*Corresponding author: tsubaki@eng.u-toyama.ac.jp

A series of cobalt catalysts have been prepared by impregnation and stirring process using NaBH4 as the reducing agent over the 3A, 4A and 5A zeolites as supports. The preparation process employed Co(NO3)2·6H2O as Co resource and NaBH4 as in situ reductant to directly prepare Co supported zeolite catalysts through two different preparation ways. In the hydroformylation of 1-hexene, the major by-product is iso-heptanal that has branch and larger thermodynamic radius than the desired product of normal heptanal. Therefore, we aim to utilize the confined space afforded by zeolite cell cage to restrict the formation of iso-heptanal, at the same time facilitating the generation of normal heptanal. With zeolite as the cage of active catalysts, we can effectively construct a confined reaction space to direct the hydroformylation reaction route and control the products distribution. The in-situ reduction method here significantly improved the conversion of 1-hexene to 92.2% for 4A zeolite supported catalyst and normal/iso ratio of aldehyde to 1.93 for 3A zeolite supported catalyst during the reaction.

It is indicated that the preparation way for NaBH4/XA-15%Co (X=3, 4, 5) catalysts can effectively depress the formation of internal hexane, at the same time facilitating the formation of normal heptanal. Above all, this developed method combined the two advantages of shape selectivity of zeolite supports and the remarkable reducing effect of NaBH4.


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