INFLUENCE OF PROMOTERS ON THE PERFORMANCE OF AU MNOX AND PT/SNOX/SIO2LOW-TEMPERATURE CO OXIDATION CATALYSTS/

The influence of promoters on Pt/SnOx/SiO2 and Au/MnOx low-temperature CO oxidation catalysts has been investigated under stoichiometric rea ction conditions with no CO2 added to the feed gas. The performance of Pt/SnOx/SiO2 catalysts is improved significantly by the addition of 1 wt.% Fe but reduced by the addition of 5 wt.% Fe, 1 wt.% Sb, 5 wt.% S b, 1 wt.% As, 5 wt.% As and 1.8 wt.% P. The performance of Au/MnOx is improved significantly by the addition of 1 at.% Ce but reduced by the addition of 1 at.% Co. For the catalysts and conditions examined, the Au/MnOx catalysts are superior to the Pt/SnOx/SiO2 catalysts with res pect to both activity and decay characteristics.