固体催化剂活性表面的化学不均匀性

固体催化剂活性表面的化学不均匀性朱建军林西平＊（江苏石油化工学院化学工程系常州２１３０１６）关键词固体催化剂，活性表面，分形维，化学不均匀性１９９６－１０－２８收稿，１９９７－０３－１０修回中国石化总公司和回国留学服务中心资助项目本院九五届毕业生于晓...

Chemical Heterogeneity of Activei Surface of Solid Catalysts

The chemical adsorption behavior of three adsorbates (methanol, n butylamine and hydrogen gas) on Ni W/F Al 2O 3 SiO 2 catalyst and supported Ni catalyst have been investigated. The roughness fractal dimension ( D r) and the chemisorption fractal dimension ( D c) of two catalysts were estimated based on the fractal geometry consideration. The difference between D c and D r was used to characterize the chemical heteorgeneity of the active sites on the catalyst surface. The results showed that the chemical heterogeneity of the acid sites of Ni W/F Al 2O 3 SiO 2 was very great and that of the supported Ni catalyst was decreased with increase of the impregnation time during catalyst preparation. For the supported Ni catalyst it is found that the chemical heterogeneity of its active surface was eliminated after four times impregnation.