Pd/SiC催化乙炔选择性加氢反应性能及构效研究OA

The Pd/SiC catalyst,with high-thermal-conductivity SiC as the support,was prepared by the sol-immobilization method and applied in selective hydrogenation of acetylene.The structure-property relationship of the prepared Pd/SiC catalyst was investigated using characterization methods such as HRTEM,CO-FTIR,XRD,and XPS,as well as computational fluid dynamics(CFD)simulation.The experimental results show that compared with the commonly used Pd/Al2O3,Pd/SiC exhibits higher intrinsic activity(the conversion frequency of 0.029 6 s-1),higher ethylene selectivity(conversion of 92%with selectivity of 73%),and better sintering resistance.The characterization results indicate that the high activity is attributed to the higher Pd dispersion,while the high selectivity stems from the higher electron density of Pd.CFD simulation analysis reveals that the excellent thermal conductivity of Pd/SiC can effectively suppress the temperature rise of the catalyst bed,thereby enhancing the sintering resistance of the catalyst.