Effect of the preparation method on the catalytic activity and stability of Au/Fe2O3 catalysts in the low-temperature water-gas shift reaction

• Type: Article in International Scientific Journal
• Date: 2014

Authors

M.A. Soria (Author) FEUP; P. Pérez (Author) FEUP; S. A. C. Carabineiro (Author) FEUP; F. J. Maldonado-Hódar (Author) Other; A. Mendes (Author) FEUP; Luís M. Madeira (Author) FEUP

Journal

Title: Applied Catalysis A: General

Vol. 470 No. Jan 30-2014

Pages: 45-55

ISSN: 0926-860X

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 30 Citations

ISI Web of Science

Scopus - 39 Citations

Scientific classification

CORDIS: Technological sciences > Engineering > Chemical engineering ; Physical sciences > Chemistry > Heterogeneous catalysis

FOS: Engineering and technology > Chemical engineering

Associated Projects

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

Other information

Authenticus ID: 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11