Ethyl acetate abatement on copper catalysts supported on ceria doped with rare earth oxides

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

Autores

Sónia Alexandra Correia Carabineiro (Autor) FEUP; Michalis Konsolakis (Autor) Outra; George Emmanouil-Nontas Marnellos (Autor) Outra; Muhammad Faizan Asad (Autor) FEUP; Olívia Salomé Gonçalves Pinto Soares (Autor) FEUP; Pedro Bandeira Tavares (Autor) Outra; Manuel Fernando Ribeiro Pereira (Autor) FEUP; José Joaquim de Melo Órfão (Autor) FEUP; José Luís Figueiredo (Autor) FEUP

Revista

Título: Molecules

Vol. 21 Nº 5

Página Final: 644

ISSN: 1420-3049

Editora: MDPI

Indexação

ISI Web of Knowledge - 14 Citações

Scopus - 26 Citações

Projetos Associados

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

Outras Informações

ID Authenticus: P-00K-J73

DOI: 10.3390/molecules21050644

Abstract (EN): Different lanthanide (Ln)-doped cerium oxides (Ce(0.5)Ln(0.5)O(1.75), where Ln: Gd, La, Pr, Nd, Sm) were loaded with Cu (20 wt. %) and used as catalysts for the oxidation of ethyl acetate (EtOAc), a common volatile organic compound (VOC). For comparison, both Cu-free (Ce-Ln) and supported Cu (Cu/Ce-Ln) samples were characterized by N-2 adsorption at -196 degrees C, scanning/transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and temperature programmed reduction in H-2. The following activity sequence, in terms of EtOAc conversion, was found for bare supports: CeO2 approximate to Ce0.5Pr0.5O1.75 > Ce0.5Sm0.5O1.75 > Ce0.5Gd0.5O1.75 > Ce0.5Nd0.5O1.75 > Ce0.5La0.5O1.75. Cu addition improved the catalytic performance, without affecting the activity order. The best catalytic performance was obtained for Cu/CeO2 and Cu/Ce0.5Pr0.5O1.75 samples, both achieving complete EtOAc conversion below ca. 290 degrees C. A strong correlation was revealed between the catalytic performance and the redox properties of the samples, in terms of reducibility and lattice oxygen availability. No particular correlation between the VOC oxidation performance and textural characteristics was found. The obtained results can be explained in terms of a Mars-van Krevelen type redox mechanism involving the participation of weakly bound (easily reduced) lattice oxygen and its consequent replenishment by gas phase oxygen.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 20