CWAO of butyric acid solutions: Catalyst deactivation analysis

• Tipo: Artigo em Revista Científica Internacional
• Data: 2004

Autores

Helder T. Gomes (Autor) Outra; José J. M. Órfão (Autor) FEUP; José L. Figueiredo (Autor) FEUP; Joaquim L. Faria (Autor) FEUP

Revista

Título: Industrial & Engineering Chemistry Research

Vol. 43 Nº 5

Páginas: 1216-1221

ISSN: 0888-5885

Editora: American Chemical Society

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 14 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

Outras Informações

ID Authenticus: P-000-B8S

DOI: 10.1021/ie034029y

Abstract (EN): Carbon-supported platinum and iridium catalysts were prepared for catalytic wet air oxidation (CWAO) applications. These catalysts were tested in the CWAO of butyric acid aqueous solutions at 200 degreesC and 6.9 bar of oxygen partial pressure, and significant conversions above 70% were obtained depending on the catalyst used. The long-term deactivation resistance of the PVC catalyst is higher than that of the Ir/C catalyst. The deactivation observed with the Ir/C catalyst was attributed to the overoxidation of the surface of iridium by molecular oxygen. A deactivation study of the catalysts was conducted using N-2 adsorption, thermogravimetric analysis, temperature-programmed reduction, and X-ray photoelectron spectroscopy. A kinetic model describing the observed deactivation phenomena in the Ir/C catalyst is proposed and tested using the experimental data obtained in the CWAO of the systems studied.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6