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Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon

Stadie, Nicholas P. and Murialdo, Maxwell and Ahn, Channing C. and Fultz, Brent (2013) Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon. Journal of the American Chemical Society, 135 (3). pp. 990-993. ISSN 0002-7863. doi:10.1021/ja311415m.

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A thermodynamic study of the enthalpy of adsorption of methane on high surface area carbonaceous materials was carried out from 238 to 526 K. The absolute quantity of adsorbed methane as a function of equilibrium pressure was determined by fitting isotherms to a generalized Langmuir-type equation. Adsorption of methane on zeolite-templated carbon, an extremely high surface area material with a periodic arrangement of narrow micropores, shows an increase in isosteric enthalpy with methane occupancy; i.e., binding energies are greater as adsorption quantity increases. The heat of adsorption rises from 14 to 15 kJ/mol at near-ambient temperature and then falls to lower values at very high loading (above a relative site occupancy of 0.7), indicating that methane/methane interactions within the adsorption layer become significant. The effect seems to be enhanced by a narrow pore-size distribution centered at 1.2 nm, approximately the width of two monolayers of methane, and reversible methane delivery increases by up to 20% over MSC-30 at temperatures and pressures near ambient.

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Fultz, Brent0000-0002-6364-8782
Additional Information:© 2012 American Chemical Society. Received: November 20, 2012. Published: December 23, 2012. Publication Date (Web): December 23, 2012. We thank John Vajo and Robert Cumberland for discussions and materials synthesis. This work was supported as part of EFree, an Energy Frontier Research Center under Award No. DE-SG0001057. The authors declare no competing financial interest.
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Department of Energy (DOE)DE-SG0001057
Issue or Number:3
Record Number:CaltechAUTHORS:20130305-085444971
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Official Citation:Anomalous Isosteric Enthalpy of Adsorption of Methane on Zeolite-Templated Carbon Nicholas P. Stadie, Maxwell Murialdo, Channing C. Ahn, and Brent Fultz Journal of the American Chemical Society 2013 135 (3), 990-993
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37294
Deposited By: Ruth Sustaita
Deposited On:05 Mar 2013 17:21
Last Modified:09 Nov 2021 23:28

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