Abstract
The alumina contribution to CO oxidation in the absence of O 2 on metal oxide supported catalysts was investigated by CO TPR and in-situ FTIR and DRIFT studies up to 800 °C. These tests were performed on two Al 2O 3 supported catalysts (1 wt.% Pt/La/γ-Al 2O 3 and 8 wt.% Cu/γ-Al 2O 3) and on two corresponding alumina supports (5 wt.% La 2O 3 stabilised γ-Al 2O 3 and high mechanical resistant spherical γ-Al 2O 3 particles). The quantitative determination of CO consumption and CO 2 and H 2 formation on the alumina supports was in agreement with a WGS reaction occurring between surface OH and CO with a predominantly 2:1 stoichiometry. In the CO TPR of metal oxide supported catalysts, in addition to the reduction of the metal, a WGS reaction took place with enhanced kinetics. This enhancement was the result of a CO spillover phenomenon from the metal to alumina hydroxyls. This phenomenon significantly affected the evaluation of the reduction degree of the supported metal and could not be neglected in the subsequent calculations.
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