Co,K-Supported Hexagonal Mesoporous Silicas for Catalytic Oxidation of 4-t-Butyltoluene

Chemical Research in Chinese Universities ›› 2010, Vol. 26 ›› Issue (4): 622-625.

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Co,K-Supported Hexagonal Mesoporous Silicas for Catalytic Oxidation of 4-t-Butyltoluene

YU Wei-hua*, ZHOU Chun-hui, TONG Dong-shen, FANG Mei and ZHANG Bo

Research Group for Advanced Materials & Sustainable Catalysis(AMSC), College of Chemical Engineering and Materials Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Received:2009-07-23 Revised:2009-09-30 Online:2010-07-25 Published:2010-10-01
Contact: YU Wei-hua, E-mail: ywh@zjut.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.20773110) and the Science Technology Foundation of Zhejiang Province, China(No.2008C21019).

Abstract

Abstract: Co,K-Supported hexagonal mesoporous silicas(HMS) have been prepared by incipient wetness impregnation with cobalt acetate tetrahydrate and potassium acetate as metal precursors, and ethylene glycol as impregnation solvent. The products have been characterized via powder X-ray diffraction, N2 adsorption-desorption isotherms and diffuse reflectance UV-Vis spectroscopy. The divalent cobalt with a tetrahedral oxygen coordination exists mainly in the calcined samples. The catalytic properties have been tested for the oxidation of 4-t-butyltoluene with dioxygen in liquid phase at mild conditions. The products offered good catalytic activities in the oxidation reactions. Co-K-HMS catalyst with loading 4% Co and 2% K(mass fraction) affords a higher yield(22.4%) of 4-t-butylbenzaldehyde at a conversion of 28.3% under the reaction conditions. Adding a proper amount of potassium in Co-HMS results in an improvement catalytic activity and stability.

Key words: Mesoporous silica, Catalyst, Cobalt, Potassium, Oxidation

YU Wei-hua*, ZHOU Chun-hui, TONG Dong-shen, FANG Mei and ZHANG Bo. Co,K-Supported Hexagonal Mesoporous Silicas for Catalytic Oxidation of 4-t-Butyltoluene[J]. Chemical Research in Chinese Universities, 2010, 26(4): 622-625.

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Co,K-Supported Hexagonal Mesoporous Silicas for Catalytic Oxidation of 4-t-Butyltoluene

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