Título: Applied Catalysis A: GeneralImportada do Authenticus Pesquisar Publicações da Revista

Vol. 470 Nº Jan 30-2014

Páginas: 45-55

ISSN: 0926-860X

Editora: Elsevier

ISI Web of Knowledge - 30 Citações

ISI Web of Science

Scopus - 39 Citações

CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química ; Ciências Físicas > Química > Catálise heterogénea

FOS: Ciências da engenharia e tecnologias > Engenharia química

ID Authenticus: P-008-GE7

DOI: 10.1016/j.apcata.2013.10.034

Abstract (EN): The low temperature water-gas-shift reaction has been studied over a series of nanosized Au/Fe2O3 catalysts. The effect of the synthesis method on the catalytic activity has been analysed. A series of catalysts with different Au loadings has been prepared by different methods: deposition-precipitation (DP), liquid phase reductive deposition (LPRD) and double impregnation method (DIM). The Au/Fe2O3 catalysts prepared by DP showed the highest CO conversion. The catalysts were characterised by hydrogen temperature programmed reduction (TPR-H-2), high-resolution transmission electron microscopy (HRTEM), X-ray powder diffraction and X-ray photoelectron spectroscopy. TPR-H-2 analysis revealed that gold promotes the reducibility of the Fe2O3 support, which is crucial in this redox reaction. HRTEM evidences a very good dispersion of gold over the iron support, with nanoparticles in the range 2.2-3.1 nm for the DP and LPRD series, and a negligible increase in the average particle size of the used samples. For the DIM series, much larger Au particles (similar to 6.6 nm) were obtained.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11