A model for adsorption of condensable vapors on nonporous materials

Bhatia, S. ; Sonwane, C. (2000) A model for adsorption of condensable vapors on nonporous materials Separation and Purification Technology, 20 (1). pp. 25-39. ISSN 1383-5866

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S1383-5866(00)00061-7


A new isotherm is proposed here for adsorption of condensable vapors and gases on nonporous materials having type II isotherms according to the Brunauer-Deming-Deming-Teller (BDDH) classification. The isotherm combines the recent molecular-continuum model in the multilayer region, with other widely used models for sub-monolayer coverage, some of which satisfy the requirement of a Henry's law asymptote. The model is successfully tested using isotherm data for nitrogen adsorption on nonporous silica, carbon and alumina, as well as benzene and hexane adsorption on nonporous carbon. Based on the data fits, out of several different alternative choices of model for the monolayer region, the Freundlich and the Unilan models are found to be the most successful when combined with the multilayer model to predict the whole isotherm. The hybrid model is consequently applicable over a wide pressure range.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Adsorption; Nonporous; Monolayer; Multilayer; Heterogeneous
ID Code:80717
Deposited On:01 Feb 2012 11:52
Last Modified:01 Feb 2012 11:52

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