SANS investigations of CO2 adsorption in microporous carbon

J. Bahadur; Y. B. Melnichenko; L. He; C. I. Contescu; N. C. Gallego; J. R. Carmichael

doi:10.1016/j.carbon.2015.08.010

SANS investigations of CO₂ adsorption in microporous carbon

J. Bahadur, Y. B. Melnichenko, L. He, C. I. Contescu, N. C. Gallego, J. R. Carmichael

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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/P_sat∼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 CO_2.

Original language	English
Pages (from-to)	535-544
Number of pages	10
Journal	Carbon
Volume	95
DOIs	https://doi.org/10.1016/j.carbon.2015.08.010
State	Published - Oct 11 2015

Funding

The research at Oak Ridge National Laboratory's (ORNL) High Flux Isotope Reactor was sponsored by the Laboratory Directed Research and Development Program and the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy . This research was supported in part by the ORNL Postdoctoral Research Associates Program, administered jointly by the ORNL and the Oak Ridge Institute for Science and Education . CIC and NCG acknowledge support from the Materials Science and Engineering Division, Office of Basic Energy Sciences, U.S. Department of Energy .

Funders	Funder number
Materials Science and Engineering Division
Office of Basic Energy Sciences
Scientific User Facilities Division
U.S. Department of Energy
Oak Ridge National Laboratory
Oak Ridge Institute for Science and Education
Laboratory Directed Research and Development

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10.1016/j.carbon.2015.08.010

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title = "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.",

author = "J. Bahadur and Melnichenko, {Y. B.} and L. He and Contescu, {C. I.} and Gallego, {N. C.} and Carmichael, {J. R.}",

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T1 - SANS investigations of CO2 adsorption in microporous carbon

AU - Bahadur, J.

AU - Melnichenko, Y. B.

AU - He, L.

AU - Contescu, C. I.

AU - Gallego, N. C.

AU - Carmichael, J. R.

PY - 2015/10/11

Y1 - 2015/10/11

N2 - 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.

AB - 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.

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SP - 535

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JO - Carbon

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SANS investigations of CO₂ adsorption in microporous carbon

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