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Pt-Sn/MgAl_2O_4催化剂的TPR和H_2-TPD研究 被引量:9

TPR AND H 2 TPD STUDIES OF Pt Sn/MgAl 2O 4 CATALYSTS
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摘要 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. 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.
出处 《催化学报》 SCIE CAS CSCD 北大核心 1999年第5期577-580,共4页
关键词 铝酸镁 丙烷 脱氢 TPR TPD 催化剂 temperature programmed reduction, temperature programmed desorption, platinum, tin, magnesium aluminate, propane, dehydrogenation
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