Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (1): 157-163.doi: 10.3866/PKU.WHXB201311271

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Influence of Copper Species on Performance of Cu/Fe2O3 Catalysts for Water Gas Shift Reaction

LIN Xing-Yi, MA Jun-Tao, CHEN Chong-Qi, ZHAN Ying-Ying, ZHENG Qi   

  1. National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2013-09-02 Revised:2013-11-27 Published:2014-01-01
  • Contact: LIN Xing-Yi E-mail:linxingyi@fzu.edu.cn
  • Supported by:

    The project was supported by the Education Department of Fujian Province Class A Science & Technology Program, China (JA08021).

Abstract:

A series of Cu/Fe2O3 catalysts with different Cu loadings were prepared using a co-precipitation method, and the relationship between their structures and catalytic activities for the water gas shift (WGS) reaction was carefully examined. It was found that the as-prepared Cu/Fe2O3 catalysts exhibit excellent WGS performances, in particular, the one containing 20% (w) CuO (CF-20) shows the best catalytic activity, with CO conversion of 97.2% at 250 ℃. Its catalytic stability is also outstanding during the temperature range of 250-400 ℃. X-ray diffraction (XRD), N2 physisorption, and H2 temperature program reduction (H2-TPR) techniques were used to characterize the crystal phases, textures, and reduction properties of the Cu/Fe2O3 catalysts. The results show that the generation of CuFe2O4, which has a spinel structure in stabilizing Cu microcrystals and is easier to be reduced at low temperature, resulting in enhancing their reduction properties and facilitating electrons transfer between Cu and Fe2O3, thus greatly improving the catalytic performance. Furthermore, (NH4)2CO3 solution treatment of the as-prepared catalysts was performed to study the effect of bulk CuO existed in the Cu/Fe2O3 catalysts. The result suggests that the bulk CuO is favor for H atom transfer between Cu and Fe2O3, thus promoting the reduction of CuFe2O4, finally improving the catalytic performance.

Key words: Water gas shift, Cu/Fe2O3 catalyst, Copper loading, CuFe2O4

MSC2000: 

  • O643.3