Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (11): 990-994.doi: 10.3866/PKU.WHXB19961107

• ARTICLE • Previous Articles     Next Articles

Influence of Ceria on the Structure and Catalytic Property of F-T Synthesis Fe/ZrO2 Catalysts

Chen Kai-Dong,Yan Qi-Jie   

  1. Department of Chemistry,Nanjing University,Nanjing 210093
  • Received:1996-06-24 Revised:1996-09-02 Published:1996-11-15
  • Contact: Yan Qi-Jie

Abstract:

Ceria promoted Fe/ZrO2 catalysts were prepared by different impregnation methods. The structure, reduction behavior, CO desorption behavior, and catalytic property of various catalysts were studied by XRD, Mossbauer spectroscopy, TPR, XPS, CO-TPD, and CO hydrogenation reaction test. It is shown that the catalytic activity of ceria promoted Fe/ZrO2 catalysts is much higher than that of the unpromoted Fe/Zr sample, while methane formation is suppressed and light olefins selectivity slightly increases. The different catalyst preparation methods affect the structure and reduction behavior of Ce-Fe/ZrO2 catalysts, but do not obviously influence the catalytic properties for CO hydrogenation. The promotion effect of ceria can be explained in terms of the formation of new catalytic active sites (Fe-CeO2 ensembles) at which CO may bond with its carbon atom to iron atom and its oxygen atom to the partially reduced cerium oxide. This results in a wakening of the C-O bond, and the dissociation and reaction of CO is markedly enhanced. 

Key words: CO hydrogenation, Light olefins, Fe/ZrO2 catalyst, Ceria promoter