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Sorption of trifluoromethane in activated carbon

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Abstract

Sorption isotherms for trifluoromethane (R-23) in activated carbon have been measured at ca. 298 and 323 K using a gravimetric microbalance. High-resolution TEM images of the activated carbon show a very uniform microstructure with no evidence of any contaminants. The adsorption in the activated carbon reaches about 22.8 mol kg−1 at 2.0 MPa and 298 K or 17.6 mol kg−1 at 2.0 MPa and 323 K. Three different adsorption models (Langmuir, multi-site Langmuir, and BET equations) have been used to analyze the activated carbon sorption data, with a particular interest in the heat of adsorption (−ΔH). The heat of adsorption for R-23 in the activated carbon was about 29.78 ± 0.04 kJ mol−1 based on the multi-site Langmuir model and is within the range of typical physical adsorption. According to the IUPAC classification, the activated carbon exhibits Type I adsorption behavior and was completely reversible. Compared with our previous work for the sorption of R-23 in zeolites (5A (Ca,Na-A), 13X (Na-X), Na,K-LSX, Na-Y, K,H-Y, Rb,Na-Y) and ionic liquids ([omim][TFES] and [emim][Tf2N]) the activated carbon had the highest adsorption capacity. The adsorption process in the activated carbon also took less time than in the zeolites or the ionic liquids to reach thermodynamic equilibrium.

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Acknowledgments

The authors thank Dr. Lloyd Abrams (retired), Dr. Alan M. Allgeier and Mr. Brian L. Wells from the DuPont Experimental Station for their assistance with obtaining the surface area and pore volume of the activated carbon and the R-23 gravimetric solubility measurements. The present work was supported by DuPont Central Research and Development.

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Authors and Affiliations

  1. DuPont Central Research and Development, Experimental Station, Wilmington, DE, 19880, USA

    Mark B. Shiflett, David R. Corbin, Beth A. Elliott & Shekhar Subramoney

  2. Research Center for Exotic NanoCarbons, Shinshu University, Nagano, Japan

    Katsumi Kaneko

  3. 32 Kingsford Lane, Spencerport, New York, NY, 14559, USA

    Akimichi Yokozeki

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  1. Mark B. Shiflett
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  2. David R. Corbin
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  3. Beth A. Elliott
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  4. Shekhar Subramoney
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  5. Katsumi Kaneko
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  6. Akimichi Yokozeki
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Correspondence to Mark B. Shiflett.

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Shiflett, M.B., Corbin, D.R., Elliott, B.A. et al. Sorption of trifluoromethane in activated carbon. Adsorption 20, 565–575 (2014). https://doi.org/10.1007/s10450-014-9601-4

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  • DOI: https://doi.org/10.1007/s10450-014-9601-4

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