Pd supported on SnO2–MnOx–CeO2 catalysts for low temperature CO oxidation

Pd deposited on CeO2, MnOx–CeO2 and SnO2–MnOx–CeO2 solid solution were tested for low temperature CO oxidation activity. Among them, Pd–MnOx–CeO2 (Pd–MC) and Pd–SnO2–MnOx–CeO2 (Pd–SMC) showed excellent low temperature activity and over 90% of CO conversion was obtained at room temperature. SO2 poisoning tests with 200ppm at room temperature showed that Pd–SMC could keep high CO conversion as compared to Pd–MC. The high CO oxidation activity of Pd–SMC at low temperatures could be attributed to strong oxidation ability of highly oxidized Pd species and interactions between Pd and solid solution support.