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Issue 2, 2006
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Selective oxidation of CO in the presence of H2, H2O and CO2 utilising Au/α-Fe2O3 catalysts for use in fuel cells

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Abstract

Au/Fe2O3 catalysts prepared using co-precipitation are described and discussed for the preferential oxidation of CO in the presence of H2, H2O and CO2. A catalyst prepared using a two-stage calcination procedure (400 °C followed by 550 °C) achieves target conversion and selectivity (>99.5% CO conversion and >50% selectivity, based on O2, for the competing conversion of H2 with O2 at 80–100 °C) for the competitive oxidation of dilute CO in the presence of moist excess H2 and CO2. The effect of the preparation method of the uncalcined precursor is described and the effects of calcination on the catalyst activity in the absence of H2, CO2 and H2O is initially explored. The catalysts are characterised in detail using electron microscopy (TEM), X-ray photoelectron spectroscopy and Mössbauer spectroscopy. For the target conversion to be achieved, it is necessary that the activity for the reverse water gas shift activity (CO2 + H2 → CO + H2O) of the catalyst is suppressed, since under the fuel cell conditions this reaction reforms CO at high CO conversions due to the presence of excess CO2 and H2. It is proposed that the two stage calcination procedure removes active sites for the water gas shift reaction whilst retaining active sites for preferential CO oxidation.

Graphical abstract: Selective oxidation of CO in the presence of H2, H2O and CO2 utilising Au/α-Fe2O3 catalysts for use in fuel cells

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Publication details

The article was received on 27 Jul 2005, accepted on 27 Sep 2005 and first published on 01 Nov 2005


Article type: Paper
DOI: 10.1039/B510762H
Citation: J. Mater. Chem., 2006,16, 199-208
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    Selective oxidation of CO in the presence of H2, H2O and CO2 utilising Au/α-Fe2O3 catalysts for use in fuel cells

    P. Landon, J. Ferguson, B. E. Solsona, T. Garcia, S. Al-Sayari, A. F. Carley, A. A. Herzing, C. J. Kiely, M. Makkee, J. A. Moulijn, A. Overweg, S. E. Golunski and G. J. Hutchings, J. Mater. Chem., 2006, 16, 199
    DOI: 10.1039/B510762H

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