Hydrogen Adsorption on Model Nanoporous Carbon Adsorbents

A. A. Fomkin and V. A. Sinitsyn

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received June 14, 2007

Abstract — Hydrogen adsorption on model nanoporous adsorbents with slit-like micropores of 0.538, 0.878, and 1.218 nm width, which were obtained by successively eliminating one, two, and three layers of hexagonal carbon from a graphite structure treated as a model cell, is estimated. The Dubinin theory of volume pore filling and the linearity of adsorption isosters are used. Hydrogen adsorption isotherms are calculated at temperatures of 20, 33, 77, 200, 300, and 400 K and pressures up to 20 MPa for the structures with mono- and bilayer carbon walls. The maximum hydrogen adsorption for the AC35 structure at a pressure of 20 MPa and a temperature of 300 K was 7.9 wt %. The effect of parameters of the porous adsorbent structure on the temperature dependence of the hydrogen adsorption is discussed.

PACS numbers: 68.43.-h