Highly dispersed platinum catalysts prepared by impregnation of texture-tailored carbon xerogels

• Type: Article in International Scientific Journal
• Date: 2006

Authors

Job, N (Author) Other; Manuel Fernando R Pereira (Author) FEUP; Lambert, S (Author) Other; Cabiac, A (Author) Other; Delahay, G (Author) Other; Colomer, JF (Author) Other; Marien, J (Author) Other; José Luis Figueiredo (Author) FEUP; Pirard, JP (Author) Other

Journal

Title: Journal of Catalysis

Vol. 240

Pages: 160-171

ISSN: 0021-9517

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 71 Citations

ISI Web of Science

Scopus - 83 Citations

Other information

Authenticus ID: P-004-K7Y

DOI: 10.1016/j.jcat.2006.03.016

Abstract (EN): Pt/C catalysts were prepared by impregnation of carbon xerogels with H(2)PtCl(6) aqueous solutions. Three supports with various pore textures were used: two micro-mesoporous (maximum pore size = 10 and 40 nm, respectively) and one micro-macroporous (maximum pore size = 70 nm). After impregnation, drying and reduction, the metal particles were at most 1-1.5 nm in diameter. The Pt dispersion was close to 100% in the case of the xerogel with large mesopores. For the two other supports, a small fraction of Pt was trapped in blocked micropores. The specific catalytic activity obtained for benzene hydrogenation was 4-10 times higher than that obtained with active charcoal-supported catalysts prepared by a similar method. The high dispersion of Pt was attributed to the presence in the xerogel of large mesopore or macropore volumes, which facilitates impregnation, and a low amount of oxygenated surface groups.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12