Citation:
Zhu Jianjun, Lin Xiping. Chemical Heterogeneity of Activei Surface of Solid Catalysts[J]. Chinese Journal of Applied Chemistry,
;1997, 14(3): 102-104.
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The chemical adsorption behavior of three adsorbates (methanol, n-butylamine and hydrogen gas) on Ni-W/F-Al2O3-SiO2 catalyst and supported Ni catalyst have been investigated. The roughness fractal dimension (Dr) and the chemisorption fractal dimension (Dc) of two catalysts were estimated based on the fractal geometry consideration. The difference between Dc and Dr 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-Al2O3-SiO2 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.
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