Highly efficient mesoporous Pd/CeO₂ catalyst for low temperature CO oxidation especially under moisture condition

The Pd/CeO₂ catalyst was successfully prepared by an improved impregnation protocol. The resulting materials possessed relatively high specific surface area and highly dispersed Pd nanoparticles. For low temperature CO oxidation reaction, 2.5wt% Pd loaded catalyst showed the much higher reaction activity. The total conversion temperature was as low as 40°C under dry condition, much lower than that synthesized by other method. More importantly, the material also showed excellent catalytic activity and stability under moisture condition. When 2.5vol% H₂O was introduced into the feed gas, the catalytic activity showed significantly enhancement, the CO total conversion temperature decreased from 40°C to 30°C. The catalytic mechanism and reaction kinetic study were also discussed in detail.