Gas−Solid Interaction and the Virial Description of the Adsorption of Methane on Steam-Activated Carbon

The virial analysis of the adsorption isotherms of methane on activated microporous chars has been used to investigate the behavior of the gas−solid interface at the temperature T = 298.2 K. A commercial char, CNS-201, is the raw material used in this study. Steam (vaporized water, H2O) has been use...

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Bibliographic Details
Published in:Langmuir 2000-02, Vol.16 (3), p.1163-1166
Main Authors: Okambawa, R, Benaddi, H, St-Arnaud, J.-M, Bose, Tapan K
Format: Article
Language:English
Subjects:
03 NATURAL GAS
08 HYDROGEN
ADSORPTION ISOTHERMS
CHARS
CHEMICAL ACTIVATION
HYDROGEN STORAGE
MATERIALS SCIENCE
METHANE
MORPHOLOGICAL CHANGES
NATURAL GAS
STORAGE
VIRIAL EQUATION
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Summary:The virial analysis of the adsorption isotherms of methane on activated microporous chars has been used to investigate the behavior of the gas−solid interface at the temperature T = 298.2 K. A commercial char, CNS-201, is the raw material used in this study. Steam (vaporized water, H2O) has been used as the activating agent for the production of the samples tested. The two-dimensional gas−solid second virial coefficients, B gs, deduced from experimental data are analyzed as a function of the duration of the activation process. We observed that the structural changes of the char during the activation process are described by the variation in the value of B gs. The virial treatment is useful to investigate the molecular behavior related to physisorption and to characterize the evolution of microporosity during the activation.
ISSN:0743-7463
1520-5827
DOI:10.1021/la9901231