Preparation and catalytic properties of Pd/ceramic membrane

The surface of ceramic membrane was first modified with a silane coupling agent KH792, and then palladium/ceramic membrane catalyst was prepared with impregnation-reduction method. The catalytic performance of Pd/ceramic membrane was evaluated using catalytic hydrogenation of p-nitrophenol as a model reaction and the effects of preparation parameters on the catalytic performance were investigated. The results showed that the modification conditions of the silane coupling agent, the impregnation conditions of palladium solution, and the reduction conditions of hydrazine hydrate all affected the catalytic performance of Pd/ceramic membrane significantly. The optimal preparation conditions are as follows: modification time of 8 h at KH792 concentration of 0.2 g/L; impregnation time of 18 h at concentration of palladium solution of 0.04 mol/L and impregnation temperature of 30°C; reduction time of 30 min at reduction temperature of 0°C. The obtained Pd/ceramic membrane under above preparation conditions exhibited good catalytic performance: the hydrogenation rate could reach 17.2 mol/(h · m²) for the model reaction.