Universal and nonuniversal supercritical adsorption in pores

ORAL

Abstract

A recent study of gas adsorption in porous carbons found a common trend in the gas uptake as a function of reduced pressure at the same relative supercritical temperature, with the exception of hydrogen [1]. Using analytical expressions (Henry's law) and computer simulations (quantum and classical) we demonstrate that the ``universal'' behavior of the classical gases and the ``deviant' behavior of hydrogen can both be understood from simple combining rules and the role of quantum effects. Thus, we reject a hypothetical explanation of the data in terms of small pores permitting just hydrogen to enter.\newline [1] D. F. Quinn, Carbon 40, 2767 (2002).

*Research supported by NSF DMR-0505160 and American Chemical Society Petroleum Research Fund (43431-G10).

Authors

  • Hye-Young Kim

    • Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, LA

  • S.M. Gatica

    • Department of Physics and Astronomy, Howard University, Washington, D.C.

  • A.D. Lueking

    • Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA

  • J.K. Johnson

    • University of Pittsburgh
    • Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA

  • M.W. Cole

    • Department of Physics, The Pennsylvania State University, University Park, PA