Combustion of propane over various metals doped CeO2 nanosheet supported ruthenium catalysts

Propane (C3H8), serving as a representative LHs, boasts inherent thermal and chemical stability over other VOCs, making its catalytic combustion at low temperatures a formidable challenge in VOCs abatement. In this manuscript, the CeO2 nanosheets doped with various rare earth or acid-base metals were synthesized via a co- precipitation method, followed by Ru loading for the combustion of C3H8. Structural and property changes induced by metal doping were investigated thoroughly. 3.5Ru/Ce0.95Pr0.05 with higher reaction rate at 100 degrees C for C3H8 combustion possesses more active Ru-O-Ce structure, which presents a prior activity with T90 of 144 degrees C lower than that of 3.5Ru/CeO2 by 9 degrees C. Doping Pr can reduce the sintering of the catalyst and loss of active Ru species. Tolerance of the catalysts to H2O, CO2, dichloromethane, and high WHSV was comparatively studied under varied reaction conditions. The 3.5Ru/Ce0.95Pr0.05 demonstrates an improved activity for dichloromethane combustion at low temperatures and shows enhanced resistance to water. The in-situ DRIFTs indicates that Pr doping does not change the reaction pathway, but changes the performance by affecting the interaction between Ru and CeO2. This study sheds the light on the design of supported Ru-based catalysts with high activity and thermal stability for LHs emissions control.