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Unusual Entropy of Adsorbed Methane on Zeolite-Templated Carbon

Stadie, Nicholas P. and Murialdo, Maxwell and Ahn, Channing C. and Fultz, Brent (2015) Unusual Entropy of Adsorbed Methane on Zeolite-Templated Carbon. Journal of Physical Chemistry C, 119 (47). pp. 26409-26421. ISSN 1932-7447.

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Methane adsorption at high pressures and across a wide range of temperatures was investigated on the surface of three porous carbon adsorbents with complementary structural properties. The measured adsorption equilibria were analyzed using a method that can accurately account for nonideal fluid properties and distinguish between absolute and excess quantities of adsorption, and that also allows the direct calculation of the thermodynamic potentials relevant to adsorption. On zeolite-templated carbon (ZTC), a material that exhibits extremely high surface area with optimal pore size and homogeneous structure, methane adsorption occurs with unusual thermodynamic properties that are greatly beneficial for deliverable gas storage: an enthalpy of adsorption that increases with site occupancy, and an unusually low entropy of the adsorbed phase. The origin of these properties is elucidated by comparison of the experimental results with a statistical mechanical model. The results indicate that temperature-dependent clustering (i.e., reduced configurations) of the adsorbed phase due to enhanced lateral interactions can account for the peculiarities of methane adsorbed on ZTC.

Item Type:Article
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URLURL TypeDescription Information
Fultz, Brent0000-0002-6364-8782
Additional Information:© 2015 American Chemical Society. Received: May 26, 2015; Revised: November 4, 2015; Publication Date (Web): November 4, 2015. This work was supported as part of EFree, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under award number DE-SC0001057. The authors declare no competing financial interest.
Funding AgencyGrant Number
Department of Energy (DOE)DE-SC0001057
Issue or Number:47
Record Number:CaltechAUTHORS:20151123-104238733
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Official Citation:Unusual Entropy of Adsorbed Methane on Zeolite-Templated Carbon Nicholas P. Stadie, Maxwell Murialdo, Channing C. Ahn, and Brent Fultz The Journal of Physical Chemistry C 2015 119 (47), 26409-26421 DOI: 10.1021/acs.jpcc.5b05021
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62327
Deposited By: Tony Diaz
Deposited On:23 Nov 2015 18:56
Last Modified:03 Oct 2019 09:17

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