Effect of cobalt loading on the solid state properties and ethyl acetate oxidation performance of cobalt-cerium mixed oxides

• Tipo: Artigo em Revista Científica Internacional
• Data: 2017

Autores

Konsolakis, M (Autor) Outra; Sónia Carabineiro (Autor) FEUP; Marnellos, GE (Autor) Outra; Asad, MF (Autor) Outra; O.S.G.P. Soares (Autor) FEUP; Manuel Fernando R Pereira (Autor) FEUP; José Melo Orfão (Autor) FEUP; José Luis Figueiredo (Autor) FEUP

Revista

Título: Journal of Colloid and Interface Science

Vol. 496

Páginas: 141-149

ISSN: 0021-9797

Editora: Elsevier

Indexação

ISI Web of Knowledge - 18 Citações

ISI Web of Science

Scopus - 44 Citações

Projetos Associados

AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable North Region of Portugal2020

Outras Informações

ID Authenticus: P-00M-F7H

DOI: 10.1016/j.jcis.2017.02.014

Abstract (EN): Cobalt-cerium mixed oxides were prepared by the wet impregnation method and evaluated for volatile organic compounds (VOCs) abatement, using ethyl acetate (EtAc) as model molecule. The impact of Co content on the physicochemical characteristics of catalysts and EtAc conversion was investigated. The materials were characterized by various techniques, including N-2 adsorption at 196 C, scanning electron microscopy (SEM), X-ray diffraction (XRD), H-2-temperature programmed reduction (H-2-TPR) and X-ray photoelectron spectroscopy (XPS) to reveal the structure-activity relationship. The obtained results showed the superiority of mixed oxides compared to bare CeO2 and Co3O4, demonstrating a synergistic effect. The optimum oxidation performance was achieved with the sample containing 20 wt.% Co (Co/Ce atomic ratio of ca. 0.75), in which complete conversion of EtAc was attained at 260 C. In contrast, temperatures above 300 C were required to achieve 100% conversion over the single oxides. Notably, a strong relationship between both the: (i) relative population, and (ii) facile reduction of lattice oxygen with the ethyl acetate oxidation activity was found, highlighting the key role of loosely bound oxygen species on VOCs oxidation. A synergistic Co-Ce interaction can be accounted for the enhanced reducibility of mixed oxides, linked with the increased mobility of lattice oxygen.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 9