The oxidation of carbon monoxide on platinum-supported binary oxide catalysts

Abstract

The kinetics of the carbon monoxide oxidation on Pt-supported MeSb2O6 (Me = Ni, Co and Cu) have been investigated in ;a recycle reactor at 80 degrees C. The catalysts contain 1% Pt (weight)-supported on NiSb2O6, CoSb2O6 and CuSb2O6. The reaction rates were measured at different carbon monoxide contents in air from 0 to 1% (voll.). The results were compared with that of Pt/SnO2/Al2O3 catalyst which showed a synergistic effect on carbon monoxide oxidation under the same conditions. Metal antimonates, MeSb2O6 (Me = Ni, Co and Cu) had no catalytic activity for CO oxidation at high and low CO contents under our reaction conditions. The catalytic activity observed on Pt/NiSb2O6, Pt/CoSb2O6 and Pt/CuSb2O6 catalysts in the zero order reaction region at high CO contents is very low or not measurable compared with that on the Pt/SnO2/Al2O3 catalyst. Therefore in the catalytic oxidation of carbon monoxide over Pt supported on different metal antimonates, no or only a low degree synergism is present compared to Pt-supported on SnO2. (C) 2000 Elsevier Science B.V. All rights reserved.