Acta Phys. -Chim. Sin. ›› 1995, Vol. 11 ›› Issue (07): 636-641.doi: 10.3866/PKU.WHXB19950714

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Infrared Studies of the Surface Structure of Commercial Pt-Re/Al2O3 Reforming Catalyst

Hu Yong-Ren,Zhang Lan-Xin,Xin Qin,Gao Xing-Tao,Ying Pin-Liang   

  1. The Research Institute of Petrochemical Processing,Beijing 100083|State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023
  • Received:1994-07-01 Revised:1994-12-05 Published:1995-07-15
  • Contact: Xin Qin

Abstract:

Infrared studies of adsorbed CO and NO on Pt/Al2O3, Re/Al2O3 and PtRe/Al2O3 were made to obtain information on the surface properties of Pt and Pt-Re reforming catalysts. The Pt/Al2O3 and Re/Al2O3 catalysts with very low concentration of supported metals and commercial Pt-Re/Al2O3 catalyst have been studied. The concentration of Pt is 0.22%, and Re is 0.43%(mass fraction). The results indicate that the infrared spectra of competitively adsorbed probe molecules NO and CO can be used to characterize the surface structure of Pt and Re on reduced Pt-Re/Al2O3 catalyst, and to make semiquantitative analysis. More direct evidence of infrared spectra of competitively adsorbed NO and CO indicates that there is no formation of Pt-Re alloys or metallic clusters on the surface of reduced Pt-Re/Al2O3 catalyst.

Key words: Infrared spectroscopy, CO, NO, Pt, Re, Surface structure