Science in China Series B: Chemistry

, Volume 43, Issue 2, pp 143–153 | Cite as

Measurement and theoretical analysis of the adsorption of supercritical methane on superactivated carbon



Adsorption/desorption isotherms of supercritical methane on superactivated carbon have been measured in the range of 0–10 MPa and 233–333 K (20 K interval). The reversibility of the physical adsorption process is acknowledged. The heat of adsorption of 16.5 kJ/mol is determined from the isotherms, and a new modeling strategy for isotherms with maximum is presented. The model yields fits to the experimental isotherms with precision of ±2%, maintaining the constancy of the characteristic energy of adsorption. The exponent of the model equation expresses the pore size distribution feature of the adsorbent. The density of the supercritical adsor-bate is evaluated as a parameter of the model. It is shown that the conventional isotherm theory works too at supercritical condition if the limit state of supercritical adsorption is introduced into isotherm modeling.


adsorption of methane activated carbon supercritical adsorption linearization adsorption model 


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Copyright information

© Science in China Press 2000

Authors and Affiliations

  1. 1.Hydrogen Energy Research CenterTianjin UniversityTianjinChina
  2. 2.Department of ChemistryTianjin UniversityTianjinChina

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