Calculation of heat of adsorption of gases and refrigerants on activated carbons from direct measurements fitted to the Dubinin-Astakhov equation

Kandadai Srinivasan, Pradip Dutta, Kim Ng, Bidyut Saha

    Research output: Contribution to journalArticlepeer-review

    14 Citations (Scopus)

    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.

    Original languageEnglish
    Pages (from-to)549-565
    Number of pages17
    JournalAdsorption Science and Technology
    Volume30
    Issue number7
    DOIs
    Publication statusPublished - Jul 1 2012

    All Science Journal Classification (ASJC) codes

    • Chemistry(all)
    • Chemical Engineering(all)
    • Surfaces and Interfaces

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