Nano Pd/ZSM-5: in Situ Synthesis and Catalytic Hydrogenation of Cinnamaldehyde

Highly dispersed Pd nanoparticles confined in the ZSM-5 zeolite catalyst (Pd/ZSM-5-IS) were successfully synthesized by azeotropic distillation assisted in situ process. The Pd/ZSM-5-IS samples were characterized by XRD, TEM and XPS. The effects of reaction pressure, reaction temperature and reaction time on the catalytic performance of cinnamaldehyde hydrogenation were investigated. These results showed that the catalytic stability of Pd/ZSM-5-IS catalyst is higher than that of Pd/ZSM-5-IM, which is mainly attributed to the fact that Pd nanoparticles enter the mesoporous mesopores of ZSM-5 to effectively prevent the active sites from loss and aggregation. When the reaction temperature is 80 degrees C, the reaction pressure is 1 MPa, the reaction time is 3 h for the best reaction conditions, the conversion of cinnamaldehyde was 87.23% and selectivity of hydrocinnamic aldehyde was 76.68%.