Chinese Journal of Catalysis ›› 2007, Vol. 28 ›› Issue (3): 246-250.

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Synthesis of Cyclohexylbenzene by Hydroalkylation of Benzene over Pd/Hβ Binary Catalyst

QIU Jun1*, Kenichi KOMURA2, Yoshihiro KUBOTA2, Yoshihiro SUGI2   

  1. 1 Department of Chemical and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, Jilin, China; 2 Department of Materials Science and Technology, Faculty of Engineering, Gifu University, Gifu 501-1193, Japan
  • Received:2007-03-25 Online:2007-03-25 Published:2007-03-25

Abstract: The Pd/Hβ binary catalyst was prepared by the impregnation method and was used for the hydroalkylation of benzene to cyclohexylbenzene. The effects of reaction temperature, reaction time, hydrogen pressure, Hβ acidity, and metal loading were investigated. The results indicated that the conversion of benzene and the selectivity for cyclohexylbenzene approached 24.3% and 88.0%, respectively, under the conditions of 2.5 MPa H2, 200 ℃, and 3 h. The preferable balance between metal active sites and acidic sites in catalyst was the key to the hydroalkylation of benzene. Moreover, the mechanism of the reaction was discussed.

Key words: palladium, Hβ molecular sieve, binary catalyst, benzene, hydroalkylation, cyclohexylbenzene