CO oxidation over Pd/SnO2 catalyst

Article abstract of DOI:10.1016/0304-5102(93)E0229-A

Oxidation of CO over the surface of SnO₂ and Pd/SnO₂ catalysts has been investigated with a view to understand the role of Pd metal particles which are known to improve the catalytic activity. The reaction occurs through the incorporation of lattice oxygen and an oxidized surface of the catalyst facilitates the CO oxidation. For Pd/SnO₂ significant CO oxidation occurs even at room temperature as monitored by CO pulse injection technique. Disproportionation of CO into CO₂ and carbon has been observed in the region 350 K ≤ T ≤ 425 K. From ¹¹⁹Sn Mossbauer investigations the existence of Sn²⁺ species in the support matrix has been observed and its extent is affected by Pd incorporation. The effect of oxygen and/or hydrogen pretreatment of Pd/SnO₂ catalyst at different temperatures on its catalytic activity has been discussed.