A Thermodynamic Investigation of Adsorbate-Adsorbate Interactions of Carbon Dioxide on Nanostructured Carbons
Abstract
A thermodynamic study of carbon dioxide adsorption on a zeolite-templated carbon (ZTC), a superactivated carbon (MSC-30) and an activated carbon (CNS-201) was carried out at temperatures from 241 to 478 K and pressures up to 5.5•10^6 Pa. Excess adsorption isotherms were fitted with generalized Langmuir-type equations, allowing the isosteric heats of adsorption and adsorbed-phase heat capacities to be obtained as a function of absolute adsorption. On MSC-30, a superactivated carbon, the isosteric heat of carbon dioxide adsorption increases with occupancy from 19 to 21 kJ•mol^(−1), before decreasing at high loading. This increase is attributed to attractive adsorbate-adsorbate intermolecular interactions as evidenced by the slope and magnitude of the increase in isosteric heat and the adsorbed-phase heat capacities. An analysis of carbon dioxide adsorption on ZTC indicates a high degree of binding-site homogeneity. A generalized Law of Corresponding States analysis indicates lower carbon dioxide adsorption than expected.
Additional Information
© 2017 American Institute of Chemical Engineers (AIChE). Received: Aug 20, 2016; Revised: Jan 09, 2017; Accepted: Oct 09, 2017; Accepted manuscript online: 10 October 2017. This work was supported as part of EFree, an Energy Frontier Research Center under Award No. DE-SC0001057. A special thanks to Christopher Gardner for his contributions in the lab.Attached Files
Accepted Version - Murialdo_et_al-2017-AIChE_Journal.pdf
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Additional details
- Eprint ID
- 82286
- Resolver ID
- CaltechAUTHORS:20171011-123647370
- Department of Energy (DOE)
- DE-SC0001057
- Created
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2017-10-11Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field