Abstract
Abstract A study of the CO oxidation reaction was conducted on a CuO–CeO 2 catalyst, with a copper content of 20 at%. The stability, activity and selectivity of this sample were evaluated in the absence of H 2 and also under PROX conditions (i.e. in great H 2 excess). The influence of the reaction temperature and the feed composition was also analyzed. It was found that water and CO 2 have a negative effect on the catalytic activity. Except for the undesired oxidation of hydrogen, the occurrence of other lateral reactions that could be present in the PROX reactor can be discarded. A kinetic study was carried out in order to fit a classical power-law expression for CO oxidation rate. Although this mathematical expression gave a good fit in limited concentration ranges, it was found that the partial reaction orders depend on the reactant molar fractions.
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