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Title: Adsorptive separation of CO2 in sulfur-doped nanoporous carbons: Selectivity and breakthrough simulation

Journal Article · · Microporous and Mesoporous Materials
 [1];  [1];  [2];  [2]
  1. Widener Univ., Chester, PA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this research, we have synthesized two sulfur functionalized nanoporous carbons by post-synthesis modifications with sulfur bearing activating agents that simultaneously enhanced the surface area and introduced sulfur functionalities on the carbon surface. The Brunauer–Emmett–Teller (BET) surface areas of these materials were 2865 and 837 m2/g with total sulfur contents of 8.2 and 12.9 %, respectively. The sulfur-functionalized carbons were characterized with pore textural properties, X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and electron microscopy (SEM and TEM). In both the carbons, CO2 adsorption isotherms and kinetics were measured in three different temperatures of 298, 288 and 278 K and pressures up to 760 torr. The gravimetric CO2 uptake followed the trend with BET surface area but the surface area-based uptake was reversed and it followed the trend of sulfur content. The heat of adsorption of CO2 in low uptake was 60-65 kJ/mol, which is the highest for CO2 adsorption in porous carbons. In order to investigate the adsorptive separation of CO2, N2 and CH4 adsorption isotherms were also measured at 298 K and 760 torr. The selectivity of separation for CO2/N2 and CO2/CH4 was calculated based on the Ideal Adsorbed Solution Theory (IAST) and all the results demonstrated the high CO2 selectivity for the carbon with higher sulfur content. The adsorption isotherms were combined with mass balances to calculate the breakthrough behavior of the binary mixtures of CO2/N2 and CO2/CH4. The simulation results demonstrated that the dimensionless breakthrough time is a decreasing function of the mole fraction of CO2 in the feed stream. The overall results suggest that the sulfurfunctionalized carbons can be employed as potential adsorbents for CO2 separation.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1394439
Journal Information:
Microporous and Mesoporous Materials, Vol. 241, Issue C; ISSN 1387-1811
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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