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Title: Role of Confinement on Adsorption and Dynamics of Ethane and an Ethane–CO 2 Mixture in Mesoporous CPG Silica

Abstract

It was found that ethane is confined to mineral and organic pores in certain shale formations. Effects of confinement on structural and dynamic properties of ethane in mesoporous controlled pore glass (CPG) were studied by gravimetric adsorption and quasi-elastic neutron scattering (QENS) measurements. The obtained isotherms and scattering data complement each other by quantifying the relative strength of the solid–fluid interactions and the transport properties of the fluid under confinement, respectively. We used a magnetic suspension balance to measure the adsorption isotherms at two temperatures and over a range of pressures corresponding to a bulk density range of 0.01–0.35 g/cm3. Key confinement effects were highlighted through differences between isotherms for the two pore sizes. A comparison was made with previously published isotherms for CO2 on the same CPG materials. Behavior of ethane in the smaller pore size was probed further using quasi-elastic neutron scattering. By extracting the self-diffusivity and residence time, we were able to study the effect of pressure and transition from gaseous to supercritical densities on the dynamics of confined ethane. Moreover, a temperature variation QENS study was also completed with pure ethane and a CO2–ethane mixture. Activation energies extracted from the Arrhenius plots show the effects ofmore » CO2 addition on ethane mobility.« less

Authors:
 [1];  [1];  [2];  [2];  [2];  [1];  [1];  [1]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1279407
Grant/Contract Number:  
AC05-00OR22725; SC0006878
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Physical Chemistry. C
Additional Journal Information:
Journal Volume: 120; Journal Issue: 9; Journal ID: ISSN 1932-7447
Publisher:
American Chemical Society
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE

Citation Formats

Patankar, Sumant, Gautam, Siddharth, Rother, Gernot, Podlesnyak, Andrey, Ehlers, Georg, Liu, Tingting, Cole, David R., and Tomasko, David L. Role of Confinement on Adsorption and Dynamics of Ethane and an Ethane–CO 2 Mixture in Mesoporous CPG Silica. United States: N. p., 2016. Web. https://doi.org/10.1021/acs.jpcc.5b09984.
Patankar, Sumant, Gautam, Siddharth, Rother, Gernot, Podlesnyak, Andrey, Ehlers, Georg, Liu, Tingting, Cole, David R., & Tomasko, David L. Role of Confinement on Adsorption and Dynamics of Ethane and an Ethane–CO 2 Mixture in Mesoporous CPG Silica. United States. https://doi.org/10.1021/acs.jpcc.5b09984
Patankar, Sumant, Gautam, Siddharth, Rother, Gernot, Podlesnyak, Andrey, Ehlers, Georg, Liu, Tingting, Cole, David R., and Tomasko, David L. Wed . "Role of Confinement on Adsorption and Dynamics of Ethane and an Ethane–CO 2 Mixture in Mesoporous CPG Silica". United States. https://doi.org/10.1021/acs.jpcc.5b09984. https://www.osti.gov/servlets/purl/1279407.
@article{osti_1279407,
title = {Role of Confinement on Adsorption and Dynamics of Ethane and an Ethane–CO 2 Mixture in Mesoporous CPG Silica},
author = {Patankar, Sumant and Gautam, Siddharth and Rother, Gernot and Podlesnyak, Andrey and Ehlers, Georg and Liu, Tingting and Cole, David R. and Tomasko, David L.},
abstractNote = {It was found that ethane is confined to mineral and organic pores in certain shale formations. Effects of confinement on structural and dynamic properties of ethane in mesoporous controlled pore glass (CPG) were studied by gravimetric adsorption and quasi-elastic neutron scattering (QENS) measurements. The obtained isotherms and scattering data complement each other by quantifying the relative strength of the solid–fluid interactions and the transport properties of the fluid under confinement, respectively. We used a magnetic suspension balance to measure the adsorption isotherms at two temperatures and over a range of pressures corresponding to a bulk density range of 0.01–0.35 g/cm3. Key confinement effects were highlighted through differences between isotherms for the two pore sizes. A comparison was made with previously published isotherms for CO2 on the same CPG materials. Behavior of ethane in the smaller pore size was probed further using quasi-elastic neutron scattering. By extracting the self-diffusivity and residence time, we were able to study the effect of pressure and transition from gaseous to supercritical densities on the dynamics of confined ethane. Moreover, a temperature variation QENS study was also completed with pure ethane and a CO2–ethane mixture. Activation energies extracted from the Arrhenius plots show the effects of CO2 addition on ethane mobility.},
doi = {10.1021/acs.jpcc.5b09984},
journal = {Journal of Physical Chemistry. C},
number = 9,
volume = 120,
place = {United States},
year = {2016},
month = {2}
}

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