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

• Type: Article in International Scientific Journal
• Date: 2002

Authors

Fraga, MA (Author) Other; Jordao, E (Author) Other; Mendes, MJ (Author) Other; Freitas, MMA (Author) Other; Faria, JL (Author) FEUP; Figueiredo, JL (Author) FEUP

Journal

Title: Journal of Catalysis

Vol. 209

Pages: 355-364

ISSN: 0021-9517

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 173 Citations

ISI Web of Science

Scopus - 196 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-000-NMH

DOI: 10.1006/jcat.2002.3637

Abstract (EN): 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).

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10