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).
Authors
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Hye-Young Kim
Department of Chemistry and Physics, Southeastern Louisiana University, Hammond, LA
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S.M. Gatica
Department of Physics and Astronomy, Howard University, Washington, D.C.
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A.D. Lueking
Department of Energy and Mineral Engineering, The Pennsylvania State University, University Park, PA
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J.K. Johnson
University of Pittsburgh, Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA
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M.W. Cole
Department of Physics, The Pennsylvania State University, University Park, PA