SANS Investigations of CO2 Adsorption in Microporous Carbon
Abstract
The high pressure adsorption behavior of CO2 at T = 296 K in microporous carbon was investigated by small-angle neutron scattering (SANS) technique. A strong densification of CO2 in micropores accompanied by non-monotonic adsorption-induced pore deformation was observed. The density of confined CO2 increases rapidly with pressure and reaches the liquid –like density at 20 bar, which corresponds to the relative pressure of P/Psat ~0.3. At P > 20 bar density of confined CO2 increases slowly approaching a plateau at higher pressure. The size of micropores first increases with pressure, reaches a maximum at 20 bar, and then decreases with pressure. A complementary SANS experiment conducted on the same microporous carbon saturated with neutron-transparent and non-adsorbing inert gas argon shows no deformation of micropores at pressures up to ~200 bars. This result demonstrates that the observed deformation of micropores in CO2 is an adsorption-induced phenomenon, caused by the solvation pressure - induced strain and strong densification of confined CO2 .
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1214021
- Alternate Identifier(s):
- OSTI ID: 1247083
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Carbon
- Additional Journal Information:
- Journal Volume: 95; Journal ID: ISSN 0008-6223
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Bahadur, Jitendra, Melnichenko, Yuri B., He, Lilin, Contescu, Cristian I., Gallego, Nidia C., and Carmichael, Justin R. SANS Investigations of CO2 Adsorption in Microporous Carbon. United States: N. p., 2015.
Web. doi:10.1016/j.carbon.2015.08.010.
Bahadur, Jitendra, Melnichenko, Yuri B., He, Lilin, Contescu, Cristian I., Gallego, Nidia C., & Carmichael, Justin R. SANS Investigations of CO2 Adsorption in Microporous Carbon. United States. https://doi.org/10.1016/j.carbon.2015.08.010
Bahadur, Jitendra, Melnichenko, Yuri B., He, Lilin, Contescu, Cristian I., Gallego, Nidia C., and Carmichael, Justin R. Fri .
"SANS Investigations of CO2 Adsorption in Microporous Carbon". United States. https://doi.org/10.1016/j.carbon.2015.08.010. https://www.osti.gov/servlets/purl/1214021.
@article{osti_1214021,
title = {SANS Investigations of CO2 Adsorption in Microporous Carbon},
author = {Bahadur, Jitendra and Melnichenko, Yuri B. and He, Lilin and Contescu, Cristian I. and Gallego, Nidia C. and Carmichael, Justin R.},
abstractNote = {The high pressure adsorption behavior of CO2 at T = 296 K in microporous carbon was investigated by small-angle neutron scattering (SANS) technique. A strong densification of CO2 in micropores accompanied by non-monotonic adsorption-induced pore deformation was observed. The density of confined CO2 increases rapidly with pressure and reaches the liquid –like density at 20 bar, which corresponds to the relative pressure of P/Psat ~0.3. At P > 20 bar density of confined CO2 increases slowly approaching a plateau at higher pressure. The size of micropores first increases with pressure, reaches a maximum at 20 bar, and then decreases with pressure. A complementary SANS experiment conducted on the same microporous carbon saturated with neutron-transparent and non-adsorbing inert gas argon shows no deformation of micropores at pressures up to ~200 bars. This result demonstrates that the observed deformation of micropores in CO2 is an adsorption-induced phenomenon, caused by the solvation pressure - induced strain and strong densification of confined CO2 .},
doi = {10.1016/j.carbon.2015.08.010},
journal = {Carbon},
number = ,
volume = 95,
place = {United States},
year = {Fri Aug 07 00:00:00 EDT 2015},
month = {Fri Aug 07 00:00:00 EDT 2015}
}
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