Abstract
Infrared studies of adsorbed CO and NO on Pt/Al2O3, Re/Al2O3 and Pt-Re/Al2O3 were made to obtain information on the surface properties of Pt and Pt-Re reforming catalysts. The Pt/Al2O3 and Re/Al2O3 catalyst with very low concentration of supported metals and commercial Pt/Al2O3 catalyst have heen 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 surfae 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.
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