Examination of the Approximations Used in Determining the Isosteric Heat of Adsorption from the ClausiusClapeyron Equation Academic Article uri icon


  • The effects of the two critical assumptions, an ideal bulk gas phase and a negligible adsorbed phase molar volume, on the calculated isosteric heats of adsorption were studied. The isosteric heats of adsorption of ethane, propane, and butane on heterogenous activated carbon were calculated in three different ways: 1) using the classic Clausius-Clapeyron equation; assuming ideal gas for the bulk gas phase, while taking into account the adsorbed phase volume; and 3) relaxing both assumptions by nonlocal density functional theory (NDFT), and describing the bulk gas by the Carnahan-Starling equation of state plus a mean-field attraction (CSPMA).

published proceedings

  • Langmuir

author list (cited authors)

  • Pan, H., Ritter, J. A., & Balbuena, P. B.

citation count

  • 255

complete list of authors

  • Pan, Huanhua||Ritter, James A||Balbuena, Perla B

publication date

  • October 1998