Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (12): 1074-1078.doi: 10.3866/PKU.WHXB19961205

• ARTICLE • Previous Articles     Next Articles

Correlation Between the Catalytic Property and Zr3+ Ion for ZrO2 in F-T Reaction

Li Wen,Yin Yuan-Qi,Feng Liang-Bo,Zheng Pei-Ju   

  1. Lanzhou Institute of Chemical Physics,Chinese Academy of Science,Lanzhou 730000|Research Center of Analysis and Measurement,Fudan University,Shanghai 200433
  • Received:1996-03-11 Revised:1996-07-29 Published:1996-12-15
  • Contact: Li Wen

Abstract:

CO hydrogenation was studied over zirconia catalysts. The catalysts, which were classed into three types of samples-the fresh, used and specially treated catalysts, were characterized by means of EPR spectroscopy. A strong signal at g⊥=1 .976 and g||=1.961, which was assigned to Zr3+ ion on the surface of ZrO2, was observed for the fresh catalysts. In contrast, unique strong and sharp signal at g=2.0024, which was assigned to dissociated H atom, also was observed for the used catalysts. Further verification of the assignments was carried out by EPR characterization of the specially treated catalysts. These results show that Zr3+ ion might involve in CO hydrogenation. Quantitative studies reveal that there is a close linear relation between Zr3+ ion and the selectivity to isobutene for the reaction over ZrO2. Finally, a possible mechanism of the catalytic reaction via a surface species Zr(Ⅲ)(CO)2 was proposed.

Key words: EPR spectra, ZrO2 catalyst, Zr3+ ion