Chinese Journal of Catalysis ›› 2013, Vol. 34 ›› Issue (4): 684-694.DOI: 10.1016/S1872-2067(11)60489-0

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Selective hydrogenation of benzene to cyclohexene over nanocomposite Ru-Mn/ZrO2 catalysts

SUN Haijie, JIANG Houbing, LI Shuaihui, WANG Hongxia, PAN Yajie, DONG Yingying, LIU Shouchang, LIU Zhongyi*   

  1. College of Chemistry and Molecular Engnineering, Zhengzhou University, Zhengzhou 450001, Henan, China
  • Received:2012-10-10 Revised:2012-11-20 Online:2013-04-23 Published:2013-04-24
  • Supported by:

    This work was supported by the National Nature Science Foundation of China (21273205), the Innovation Found for Technology Based Firms of China (10C26214104505), the China Postdoctoral Science Fundation (2012M511125), and the Scientific Research Foundation of Graduate School of Zhengzhou University.

Abstract:

A series of Ru-Mn catalysts with different Mn contents were prepared by coprecipitation, and their catalytic performance, using nanoscale ZrO2 as a dispersant, for the selective hydrogenation of benzene to cyclohexene was investigated. The catalysts were characterized using X-ray diffraction, transmission electron microscopy, N2 physisorption, X-ray fluorescence, atomic absorption spectroscopy, and Auger electron spectroscopy. The results confirmed that the Mn existed as Mn3O4 on the Ru surface. The Mn3O4 reacted with ZnSO4 to form an insoluble [Zn(OH)2]3(ZnSO4)(H2O)3 salt, which was readily chemisorbed on the Ru surface. This chemisorbed salt played a key role in improving the cyclohexene selectivity over the Ru catalyst. The cyclohexene yield of 61.3% was obtained over the Ru-Mn catalyst with the optimum Mn content of 5.4%. This catalyst had good stability and excellent reusability.

Key words: Benzene, Selective hydrogenation, Cyclohexene, Ruthenium, Manganese, Zirconia, Zinc