Properties of carbon-supported platinum catalysts: Role of carbon surface sites

被引：207
作者：
Fraga, MA
Jordao, E
Mendes, MJ
Freitas, MMA
Faria, JL
Figueiredo, JL
机构：
[1] Univ Estadual Campinas, FEQ DESQ, Lab Desenvolvimento Proc Catalit, BR-13083970 Campinas, SP, Brazil
[2] Univ Porto, Fac Engn, Dept Engn Quim, Lab Catalise & Mat, P-4200465 Oporto, Portugal
来源：
JOURNAL OF CATALYSIS | 2002年 / 209卷 / 02期
关键词：
activated carbon; oxidative treatments; platinum catalysts; strong adsorption; surface basic sites;
D O I：
10.1006/jcat.2002.3637
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of oxidation treatments of the support on the properties of carbon-supported platinum catalysts has been analyzed. A set of activated carbon carriers has been prepared by oxidative treatments of a commercial carbon in liquid as well as in gas phase. The carbons obtained had largely identical pore structures but differed considerably in their surface chemistry as shown, for example, by their point of zero charge (PZC) values. The catalysts were prepared by equilibrium impregnation of the supports with an aqueous solution of hexachloroplatinic acid. N-2 adsorption, TPD, XPS, TPR, and H-2 chemisorption were used to characterize the supports and the catalysts. The Pt load of the catalysts was found to depend on the PZC of the supports. However, the Pt dispersion was found to depend on the total surface oxygen content of the supports. These results were rationalized by the assumption that the surface basic groups of the supports are anchoring sites for the strong adsorption of platinum. (C) 2002 Elsevier Science (USA).
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页码：355 / 364
页数：10
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