Catalytic reaction mechanism of Pd/Zr/Al2O3 catalyst for ventilation air methane combustion
XU Xin
LIU Wen-ge
LIU Jian-zhou
HAN Jia-ye
FAN Chuan-feng
Abstract：Pd/Al2O3 monolithic catalysts were prepared using Al2O3 porous material with both mesopores and three-di mensional interconnected macropores as the support and Ce,Zr as additives.Ultra-low concentration ventilation air methane combustion activity on the as-synthesized catalysts was investigated and the reaction path was predicted.Results show that the reaction performance of catalysts with the additives is excellent owing to the maintained special microstructure of the original support and large BET surface value.Pd/Al2O3 catalysts with additive Zr have a better reaction activity than addition of Ce.The possible reaction path of CH4 catalytic combustion on Pd/Zr/Al2O3 catalyst was predicted as follows:one of the C-H bonding strength in the molecule CH4 adsorbed on the PdO-Pd active sites aredecreased with the help of additive Zr to be lower than that of bonding strength between H and atom O in the PdO surface lattice,resulting in the escape of one atom H from the molecule CH4 and the accomplishment of the controlling step.CO2 and H2O are generated quickly after that process.
Keywords：VAMPd/Al2O3 monolithic catalystcatalytic performancereaction path
Publication Date：2017-01-01
Pages：6( 659-664 )