Highly dispersed activated carbon supported platinum catalysts prepared by OMCVD: a comparison with wet impregnated catalysts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2003

Autores

A. E. Aksoylu (Autor) Outra; Joaquim L. Faria (Autor) FEUP; Manuel Ribeiro Pereira (Autor) FEUP; José Luís Figueiredo (Autor) FEUP; P. Serp (Autor) Outra; J. C. Hierso (Autor) Outra; R. Feurer (Autor) Outra; Y. Kihn (Autor) Outra; P. Kalck (Autor) Outra

Revista

Título: Applied Catalysis A: General

Vol. 243 Nº 2

Páginas: 357-365

ISSN: 0926-860X

Editora: Elsevier

Indexação

ISI Web of Knowledge - 45 Citações

ISI Web of Science

Scopus - 47 Citações

COMPENDEX

Classificação Científica

FOS: Ciências exactas e naturais > Química

Outras Informações

ID Authenticus: P-000-H2T

DOI: 10.1016/s0926-860x(02)00556-2

Abstract (EN): This study shows that the air oxidation treatment of an activated carbon originates drastic changes in its chemical surface composition leading to the formation of a less acidic surface with thermally stable oxygenated groups, mainly hydroxyl and carbonyl groups. The oxidation treatment also induces changes in the textural properties, although less pronounced than the extent of the chemical changes. The degree of oxidation was characterized by temperature programmed desorption (TPD). Pt/AC catalysts were prepared on the activated carbon supports by organometallic chemical vapor deposition (OMCVD). Another set of catalysts was prepared on the same supports by the classical incipient wetness impregnation method. The platinum loading of each sample was kept fixed at 1 wt.%. These Pt/AC catalysts were characterized by H-2 adsorption, temperature programmed reduction (TPR), electron microscopy (TEM), infrared spectroscopy (DRIFTS) and tested for their activity in benzene hydrogenation. The changes in the physical and chemical structures of the activated carbons have pronounced effects on the characteristics of both impregnated and OMCVD samples. The results revealed that the preparation by OMCVD on the air oxidized support leads to a drastic increase in both Pt dispersion and catalytic activity. No pronounced differences were observed between the dispersion and activity of impregnated and OMCVD samples that were prepared on the non-oxidized activated carbon.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9