Pd催化剂表面物种对丙炔加氢性能的影响OA北大核心CSTPCD

The surface species and metal dispersion of Pd catalysts were studied by H2-TPR-MS-IR,CO pulse adsorption,He-TPD,H2-TPR-MS,and AFM-IR.The surface species states of Pd catalyst were determined.The relationship between the surface species of Pd catalyst and the performance of propyne hydrogenation was also investigated.The results indicate that there are indeed carbon and nitrogen species on Pd catalyst surface,which could only be completely removed above 800℃.The presence of carbon and nitrogen species on the surface of Pd catalyst is benefit for Pd dispersion,promoting the reaction to the expected product direction,and preventing further hydrogenation of propylene.So they are benefit for selective propyne hydrogenation reactions.