Journal article
The chemical heterogeneity of active surface of solid catalysts
The chemical adsorption behaviors of three adsorbates on the Ni-W/F-Al2O3-SiO2 and the supported Ni catalysts have been investigated. On the basis of fractal geometry, the roughness fractal dimension (Dr) and the chemisorption fractal dimension (Dc) of the catalysts are estimated. We use the difference between Dc and Dr to characterize the chemical heterogeneity of active sites on the catalytic surface.
It is found that the chemical heterogeneity of the acid sites of the Ni-W/F-Al2O3-SiO2 catalyst is very large, while it decrease with increasing of impregnating operation times in preparation of the supported Ni catalyst. After 4 times impregnation, the chemical heterogeneity of its active surface for the supported Ni catalyst is eliminated.
Language: | English |
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Publisher: | Kluwer Academic Publishers |
Year: | 2000 |
Pages: | 5787-5789 |
ISSN: | 15734803 and 00222461 |
Types: | Journal article |
DOI: | 10.1023/A:1004831213726 |