Mesostructured Pd/Mn₃O₄ catalyst for efficient low-temperature CO oxidation especially under moisture condition

Mesostructured Mn₃O₄-supported Pd catalyst was successfully fabricated through a facile template-assisted pyrolysis and impregnation strategy. The resulting materials displayed large surface area and high dispersion of palladium species, and showed much enhanced catalytic activities for CO oxidation especially under moisture condition. For 2.7 wt% Pd-loaded catalyst, temperatures for 100% and 50% CO conversions were measured to be as low as 22 °C and 0 °C (4.0 vol% H₂O), respectively. More importantly, the material showed excellent catalytic stability, and no activity loss was found even after the reaction for 30 hours. This unique catalytic durability under moisture condition was assigned to the synergetic effect between Pd nanoparticles and Mn₃O₄ support.