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

  • Zhou Li 
  • Li Ming 
  • Zhou Yaping 


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 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    Ruthven, D. M., Principles of Adsorption and Adsorption Processes, New York: John Wiley & Sons, 1984, a: Chapter 3; b: 44.Google Scholar
  2. 2.
    Gregg, S. J., Sing, K. S. W., Adsorption Surface Area and Porosity, 2nd ed. London: Academic Press, 1982.Google Scholar
  3. 3.
    Ozawa, S., Kusumi, S., Ogino, Y, Physical adsorption of gases at high pressure, Journal of Colloid & Interface Science, 1976, 56(1): 83.CrossRefGoogle Scholar
  4. 4.
    Kaneko, K., Murata, K., An analytical method of micropore filling of a supercritical gas, Adsorption, 1997, 3: 197.CrossRefGoogle Scholar
  5. 5.
    Dubinin, M. M., Astakhov, V. A., Development of the concepts of volume filling of micropores in the adsorption of gases and vapors by microporous adsorbents, Izvestiya Akademii Nauk SSSR, Seriya Khimi Cheskaya, 1971, (1): 5.Google Scholar
  6. 6.
    Amankwah, K. A. G, Schwarz, J. A., A modified approach for estimating pseudo-vapor pressures in the application of the Dubinin-Astakhov equation, Carbon, 1995, 33(9): 1313.CrossRefGoogle Scholar
  7. 7.
    Dubinin, M. M., Progress in Surface and Membrane Science, Vol. 9, New York: Academic Press, 1975.Google Scholar
  8. 8.
    Malbrunot, P., Vidal, D., Vermesse, J. et al., Adsorption measurements of argon, neon, krytion, nitrogen and methane on activated carbon up to 650 MPa, Langmuir, 1992, 8(2): 577.CrossRefGoogle Scholar
  9. 9.
    Aranovich, G, Donahue, M., Adsorption of supercritical fluids, Journal of Colloid & Intefafce Science, 1996. 180: 537.CrossRefGoogle Scholar
  10. 10.
    Benard, P., Chahine, R., Modeling of high pressure adsorption isotherrms above the critical temperature on microporous adsorbents: Application to methane, Langmuir, 1997, 13: 808.CrossRefGoogle Scholar
  11. 11.
    Aranovich, G., Donahue, M., Determining surface areas from linear adsorption isotherms at supercritical conditons, Journal of Colloid & Interface Science, 1997, 194: 392.CrossRefGoogle Scholar
  12. 12.
    Zhou, Y., Zhou, L., Experimental study on high-pressure adsorption of hydrogen on activated carbon, Science in China, Series B, 1996, 39(6): 598.Google Scholar
  13. 13.
    Zhou, Y., Zhou, L., Study on the adsorption isotherms of supercritical hydrogen on activated carbon, Acta Physico-Chimica Sinica, 1997, 13(2): 119.Google Scholar
  14. 14.
    Zhou, L., Zhou, Y., Learization of adsorption isotherms for high pressure applications, Chemical Engineering Science, 1998, 53(14): 2531.CrossRefGoogle Scholar
  15. 15.
    Zhou, L., Zhou, Y., A comprehensive model for the adsorption of supercritical hydrogen on activated carbon, IEC Res., 1996, 35(11): 4166.Google Scholar

Copyright information

© Science in China Press 2000

Authors and Affiliations

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

Personalised recommendations