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Adsorption and reaction of CO on CuO–CeO2 catalysts prepared by the combustion method

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Abstract

Temperature-programmed techniques were employed to investigate the interaction of CO with CuO–CeO2 prepared by the urea-nitrates combustion method. These catalysts exhibited high and stable CO oxidation activity at relatively low reaction temperatures (< 150 °C). The CO adsorption capacity and catalytic activity of the catalysts was analogous to the concentration of easily-reduced copper oxide surface species. TPD and TPSR results can be explained by a dual scheme of CO adsorption: (i) on oxidized sites, which get reduced with simultaneous formation of surface CO2 and (ii) on reduced sites created by the former interaction. 10–20% of adsorbed CO desorbs molecularly in the absence of gas-phase O2, but reacts totally towards CO2 in the presence of gas-phase O2. Inhibition by CO2 observed under steady-state CO oxidation conditions is due to CO2 adsorption as found by CO2-TPD.

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Authors and Affiliations

  1. Foundation for Research and Technology-Hellas, Institute of Chemical Engineering and High Temperature Chemical Processes (FORTH/ICE-HT), Patras, GR-26504, Greece

    George Avgouropoulos & Theophilos Ioannides

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  1. George Avgouropoulos
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  2. Theophilos Ioannides
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Correspondence to Theophilos Ioannides.

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Avgouropoulos, G., Ioannides, T. Adsorption and reaction of CO on CuO–CeO2 catalysts prepared by the combustion method. Catal Lett 116, 15–22 (2007). https://doi.org/10.1007/s10562-007-9114-9

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  • DOI: https://doi.org/10.1007/s10562-007-9114-9

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