Skip to main content
padlock icon - secure page this page is secure

Open Access The Characterization of Non-Porous Surfaces by a Combination of the BET and the Dubinin-Radushkevich-Kaganer (DRK) Theories

Download Article:
 Download
(PDF 117.9 kb)
 
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.

20 References.

No Supplementary Data.
No Article Media
No Metrics

Keywords: DUBININ AND BET THEORIES; ENERGY DISTRIBUTION; NON-POROUS SOLIDS; VAPOUR ADSORPTION

Document Type: Research Article

Publication date: October 1, 2003

More about this publication?
  • 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.

  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Information for Advertisers
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more