Aerobic selective oxidation of alcohols using La1-xCexCoO3 perovskite catalysts

• Tipo: Artigo em Revista Científica Internacional
• Data: 2016

Autores

Junjiang Zhu (Autor) Outra; Duihai Tang (Autor) Outra; Yanxi Zhao (Autor) Outra; Y. Zhu (Autor) Outra; Zhen Zhao (Autor) Outra; Sónia A. C. Carabineiro (Autor) FEUP

Revista

Título: Journal of Catalysis

Vol. 340

Páginas: 41-48

ISSN: 0021-9517

Editora: Elsevier

Indexação

ISI Web of Knowledge

ISI Web of Science

Scopus

Projetos Associados

LSRE-LCM - Laboratório de Processos de Separação e Reação - Laboratório de Catálise e Materiais

Outras Informações

DOI: 10.1016/j.jcat.2016.04.013

Abstract (EN): The synthesis of porous perovskites with high and stable activity for alcohols oxidation using molecular oxygen as oxidant is reported. La1
xCexCoO3 catalysts are prepared by a sol–gel method using methanol and ethylene glycol as complexing agents. Calcination at 600
C allows the formation of macro- and mesopores, in contrast to similar materials that often show a bulk structure. Catalytic tests show that La0.9Ce0.1CoO3 is highly active for benzyl alcohol oxidation with molecular oxygen, with both conversion and selectivity above 95% (60 min, 88
C, 1 atm). Further tests show that 94% of the original activity can be obtained after surface regeneration of the used catalyst. The good catalytic performance is explained by the presence of cerium, which is able to attract and release adsorbed oxygen on the oxygen vacancies. The electrons donated by alcohols improve the ability of oxygen vacancies to activate molecular oxygen into oxygen anions, which react with the alcohol and increase the reaction rate. A mechanism is proposed.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 8