Exotemplated copper, cobalt, iron, lanthanum and nickel oxides for catalytic oxidation of ethyl acetate

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

Autores

Xuemeng Chen (Autor) FEUP; Sónia Carabineiro (Autor) FEUP; Sandra Bastos (Autor) FEUP; Pedro B. Tavares (Autor) Outra; José Melo Orfão (Autor) FEUP; Manuel F. R. Pereira (Autor) FEUP; José Luís Figueiredo (Autor) FEUP

Revista

Título: Journal of Environmental Chemical Engineering

Vol. 1

Páginas: 795-804

ISSN: 2213-3437

Editora: Elsevier

Indexação

ISI Web of Knowledge

ISI Web of Science

Scopus - 38 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia química

CORDIS: Ciências Físicas > Química > Catálise heterogénea

Outras Informações

ID Authenticus: P-008-HP7

DOI: 10.1016/j.jece.2013.07.019

Abstract (EN): Oxides of cobalt, copper, iron, lanthanum and nickel were prepared by an exotemplating method using two carbon materials as templates: carbon xerogel (CX) and a commercial activated carbon (AC). Samples were characterized by thermogravimetry and differential scanning calorimetry, N2 adsorption at -196 C, temperature programmed reduction, scanning electron microscopy and X-ray diffraction. All exotemplated samples showed improvements in surface area, compared with analogue commercial samples. The materials obtained were tested for ethyl acetate oxidation. CX was found to be a better templating material than AC, producing more active oxide materials. CX exotemplated NiO and Fe 2O3 showed a large improvement in performance for the catalytic oxidation of ethyl acetate, compared to the commercial samples and AC analogues; nevertheless, CX exotemplated Co3O4 was the best catalyst. The commercial Co3O4 material showed also a good catalytic performance, being the most active of the commercial samples. However, some deactivation was observed with time. On the other hand, deactivation did not occur with the exotemplated material, which showed no decrease in performance up to 5 cycles and up to 72 h of continuous operation (the maximum studied). The enhanced reducibility of exotemplated samples explains their better catalytic activities relatively to the commercial oxides.

Idioma: Inglês

Tipo (Avaliação Docente): Científica