Redox properties and VOC oxidation activity of Cu catalysts supported on Ce1-xSmxO delta mixed oxides

• Tipo: Artigo em Revista Científica Internacional
• Data: 2013

Autores

M. Konsolakis (Autor) Outra; S.A.C. Carabineiro (Autor) FEUP; P.B. Tavares (Autor) Outra; J.L. Figueiredo (Autor) FEUP

Revista

Título: Journal of Hazardous Materials

Vol. 261

Páginas: 512-521

ISSN: 0304-3894

Editora: Elsevier

Indexação

ISI Web of Knowledge - 13 Citações

ISI Web of Science

Scopus - 9 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química

Outras Informações

ID Authenticus: P-006-JRZ

DOI: 10.1016/j.jhazmat.2013.08.016

Abstract (EN): A series of Cu catalysts supported on Ce1-xSmxO delta mixed oxides with different molar contents (x = 0, 0.25, 0.5, 0.75 and 1), was prepared by wet impregnation and evaluated for volatile organic compounds (VOC) abatement, employing ethyl acetate as model molecule. An extensive characterization study was undertaken in order to correlate the morphological, structural and surface properties of catalysts with their oxidation activity. The optimum performance was obtained with Cu/CeO2 catalyst, which offers complete conversion of ethyl acetate into CO2 at temperatures as low as 260 degrees C. The catalytic performance of Cu/Ce1-xSmxO delta was interpreted on the basis of characterization studies, showing that incorporation of samarium in ceria has a detrimental effect on the textural characteristics and reducibility of catalysts. Moreover, high Sm/Ce atomic ratios (from 1 to 3) resulted in a more reduced copper species, compared to CeO2-rich supports, suggesting the inability of these species to take part in the redox mechanism of VOC abatement. Sm/Ce surface atomic ratios are always much higher than the nominal ratios indicating an impoverishment of catalyst surface in cerium oxide, which is detrimental for VOC activity.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10