Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (03): 667-673.doi: 10.3866/PKU.WHXB201112221

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Effect of Calcination Temperature of Monodispersed SiO2 on the Performance of Rh-Based Catalysts for CO Hydrogenation

YU Jun1,2, MAO Dong-Sen2, GUO Qiang-Sheng2, HAN Lu-Peng2, LU Guan-Zhong1,2   

  1. 1. Research Institute of Industrial Catalysis, East China University of Science and Technology, Shanghai 200237, P. R. China;
    2. Research Institute of Applied Catalysis, Shanghai Institute of Technology, Shanghai 201418, P. R. China
  • Received:2011-10-11 Revised:2011-12-01 Published:2012-02-23
  • Contact: MAO Dong-Sen, LU Guan-Zhong;
  • Supported by:

    The project was supported by the Science and Technology Commission of Shanghai Municipality, China (08520513600), Leading Academic Discipline Project of Shanghai Education Committee, China (J51503), and Shanghai Special Fund for Outstanding Young Teachers, China (yyy10083).

Abstract: Based on a comparison of catalytic performances of Rh-Mn-Li/SiO2 catalysts, in which commercial SiO2 and monodispersed SiO2 synthesized by the Stöber method were used as the support, respectively, the effect of the calcination temperature of the synthesized SiO2 on the catalytic performance of Rh-Mn-Li/SiO2 for CO hydrogenation to C2 oxygenates was investigated. Fourier transform infrared spectroscopy, N2 adsorption-desorption, temperature-programmed reduction with hydrogen (H2-TPR), and temperature-programmed surface reaction (TPSR) were used to characterize the physico-chemical properties of the SiO2 supports and the corresponding catalysts. The results showed that the number of surface Si―OH groups on the SiO2 supports affected the dispersion of metal and the interaction between Rh and Mn. Large amount of surface Si―OH groups was favorable for the dispersion of Rh particles and CO adsorption, and enhanced the activity of the catalyst. An appropriate amount of Si ―OH groups can gain moderate interaction between the Rh and Mn. This interaction is conducive to achieve the right CO dissociation ability, which is favorable for the insertion of CO to CHx, and ultimately increases the selectivity of C2 oxygenates.

Key words: Rh-Mn-Li/SiO2, CO hydrogenation, C2 oxygenate, Calcination temperature


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