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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2006

Autores

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

Revista

Título: Journal of Catalysis

Vol. 240

Páginas: 160-171

ISSN: 0021-9517

Editora: Elsevier

Indexação

ISI Web of Knowledge - 71 Citações

ISI Web of Science

Scopus - 83 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12