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Calculation of Heat of Adsorption of Gases and Refrigerants on Activated Carbons from Direct Measurements Fitted to the Dubinin-Astakhov Equation

Srinivasan, Kandadai and Dutta, Pradip and Ng, Kim Choon and Saha, Bidyut Baran (2012) Calculation of Heat of Adsorption of Gases and Refrigerants on Activated Carbons from Direct Measurements Fitted to the Dubinin-Astakhov Equation. In: ADSORPTION SCIENCE & TECHNOLOGY, 30 (7). pp. 549-565.

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Official URL: http://dx.doi.org/10.1260/0263-6174.30.7.549

Abstract

The heat of adsorption of methane, ethane, carbon dioxide, R-507a and R-134a on several specimens of microporous activated carbons is derived from experimental adsorption data fitted to the Dubinin-Astakhov equation. These adsorption results are compared with literature data obtained from calorimetric measurements and from the pressure-temperature relation during isosteric heating/cooling. Because the adsorbed phase volume plays an important role, its dependence on temperature and pressure needs to be correctly assessed. In addition, for super-critical gas adsorption, the evaluation of the pseudo-saturation pressure also needs a judicious treatment. Based on the evaluation of carbon dioxide adsorption, it can be seen that sub-critical and super-critical adsorption show different temperature dependences of the isosteric heat of adsorption. The temperature and loading dependence of this property needs to be taken into account while designing practical systems. Some practical implications of these findings are enumerated.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to MULTI-SCIENCE PUBL CO LTD, ENGLAND
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Francis Jayakanth
Date Deposited: 22 Jan 2013 06:21
Last Modified: 22 Jan 2013 06:24
URI: http://eprints.iisc.ac.in/id/eprint/45679

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