引用本文:
朱建军, 林西平. 固体催化剂活性表面的化学不均匀性[J]. 应用化学,
1997, 14(3): 102-104.
Citation: Zhu Jianjun, Lin Xiping. Chemical Heterogeneity of Activei Surface of Solid Catalysts[J]. Chinese Journal of Applied Chemistry, 1997, 14(3): 102-104.
Citation: Zhu Jianjun, Lin Xiping. Chemical Heterogeneity of Activei Surface of Solid Catalysts[J]. Chinese Journal of Applied Chemistry, 1997, 14(3): 102-104.
固体催化剂活性表面的化学不均匀性
English
Chemical Heterogeneity of Activei Surface of Solid Catalysts
Abstract:
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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Key words:
- solid catalyst
- / active surface
- / chemical heterogeneity
- / fratal dimension
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