The characterization of non-porous surfaces by the BET and the DRK techniques should be complementary. However, the monolayer capacities Nam obtained by these techniques may be different, with trends for the adsorption of simple molecules on a given surface. Assuming that
the BET monolayer is correct, its use in the DRK equation leads to exponents n different from the standard value n = 2. This exponent is directly related to the width of χ(ε), the distribution of the gas–solid adsorption energy ε for a given system. Therefore, the analysis
based on an extended DRK equation leads to information on the heterogeneity of the surface. For example, the data for adsorption of simple molecules physisorbed on a non-porous silica, on the (111) face of rhombic sulphur and on graphitised carbon blacks lead to average exponents of 1.2, 2.0
and 2.2 respectively, with specific scaling factors β. In the case of nitrogen adsorbed on SiO2, the value n = 1.8 suggests the presence of specific interactions.
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DUBININ AND BET THEORIES;
Document Type: Research Article
Publication date: October 1, 2003
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International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions
CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.
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