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TPR AND H 2 TPD STUDIES OF Pt Sn/MgAl 2O 4 CATALYSTS

Dong Wensheng, Wang Xinkui, Wang Haojing, Peng Shaoyi (Shanxi Institute of Coal Chemistry, The Chinese Academy of Sciences, Taiyuan 030001)  
Pt Sn/MgAl 2O 4 catalysts prepared by co impregnation with nominal 0 35% platinum and varying content of tin (0~2 5%) were characterized by temperature programmed reduction (TPR) and temperature programmed desorption of hydrogen (H 2 TPD). TPR results showed that platinum catalyzed the reduction of tin. However, the average oxidation state of tin after reduction depended upon the concentration of tin on the catalysts. H 2 TPD data indicated that tin addition inhibited the inactivated adsorption of hydrogen but promoted the activated adsorption, implying that tin modified both the ensembles of platinum and metal support interface, thus increasing hydrogen mobility and promoting hydrogen spillover.
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