Kinetics of CO oxidation over Pt-CeOx supported on air-oxidized activated carbon

Authors : Berrin Gülyüz, Şeyma Özkara Aydinoğlu

Pages : 589-598

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Publication Date : 9999-12-31

Article Type : Makaleler

Abstract :Kinetics of low-temperature CO oxidation was studied under atmospheric pressure at 383 K in the initial rates region over 1wt%Pt-1wt%CeOx supported on air-oxidized activated carbon (AC2). Feed concentrations of 1-5 mol% CO and 1-2.5 mol% O2 with balance He were used for CO oxidation in the absence of hydrogen. A simple power-function rate expression was obtained with reaction orders of -0.24 in CO and 0.98 in O2, and a plausible LHHW expression compatible with mechanisms reported in the literature was proposed. Feed concentrations of 5 mol% CO and 2.5 mol% O2 were used for investigating the effect of the presence of CO2 or H2 on CO oxidation rates by partially replacing inert He with 2-4 mol% CO2 or 10-60 mol% H2.
Keywords : Carbon monoxide, oxidation, kinetics, Pt-ceria catalysts, activated carbon supports, PROX.