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Author(s): M.A. Soria
P. Pérez
S. A. C. Carabineiro
F. J. Maldonado-Hódar
A. Mendes
Luís M. Madeira
Title: Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water-gas shift reaction
Issue Date: 2014
Abstract: 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.
Subject: Engenharia química, Catálise heterogénea, Engenharia química
Chemical engineering, Heterogeneous catalysis, Chemical engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia química
Engineering and technology::Chemical engineering
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-ERQ/098730/2008/Integração de Reactores de Membrana com Processos Adsorptivos usando-se Catalisadores Suportados em Monolitos para a Produção de Hidrogénio de Elevada Pureza/PTDC/EQU-ERQ/098730/2008
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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