Adsorption equilibrium of supercritical methane on activated carbon

ZHENG Qing-rong; LIAO Hai-feng; XIE Chen; ZHI Hui-jie

Volume 40 Issue 07

Jul. 2012

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Article Navigation > Journal of Fuel Chemistry and Technology > 2012 > 40(07): 892-896

ZHENG Qing-rong, LIAO Hai-feng, XIE Chen, ZHI Hui-jie. Adsorption equilibrium of supercritical methane on activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 892-896.

Citation:

ZHENG Qing-rong, LIAO Hai-feng, XIE Chen, ZHI Hui-jie. Adsorption equilibrium of supercritical methane on activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 892-896.

ZHENG Qing-rong, LIAO Hai-feng, XIE Chen, ZHI Hui-jie. Adsorption equilibrium of supercritical methane on activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 892-896.

Citation:

ZHENG Qing-rong, LIAO Hai-feng, XIE Chen, ZHI Hui-jie. Adsorption equilibrium of supercritical methane on activated carbon[J]. Journal of Fuel Chemistry and Technology, 2012, 40(07): 892-896.

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Adsorption equilibrium of supercritical methane on activated carbon

Institute of Marine Engineering, Jimei University, Xiamen 361021, China

Received Date: 2011-09-26
Rev Recd Date: 2011-12-03
Publish Date: 2012-07-31

Abstract

Abstract

Equilibrium adsorption data of methane on Ajax activated carbon were volumetrically measured under a temperature of 268.15~338.15 K and a pressure up to 13.5 MPa. Accessible volumes for methane molecules and critical pore width for methane effective adsorption were introduced; on the basis of these concepts, the mass balance of the adsorbate confined within the adsorption cell was used to determine the relationship among the total amount, excess adsorption amount and absolute adsorption amount. By considering the accessible volume and critical pore width, the excess adsorption amount was obtained by the pore size distribution (PSD) determined by Nonlocal Density Functional Theory (NDFT) calculation. The equilibrium adsorption data were fitted by Toth model through nonlinear regression, which was verified the accuracy in predicting the absolute adsorption amount. The isosteric heat of methane adsorption on activated carbon was over-estimated by using the excess amounts, but underestimated by using the total amounts. The isosteric heat of adsorption should be determined from the adsorption isosteres of absolute adsorption amount when considering the thermal effect in adsorption process.
- methane,
- activated carbon,
- adsorption equilibrium,
- adsorption model

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References(17)

References

DUBAND L, RAVEX A, CHAUSSY J. Adsorption isotherms of helium on activated charcoal[J]. Cryogenics, 1987, 27(7): 397-400.

MALBRUNOT P, VIDAL D, VERMESSE J, CHAHINE R, BOSE T K. Adsorbent helium density measurement and its effect on adsorption isotherms at high pressure[J]. Langmuir, 1997, 13 (3): 539-544.

DO D D, DO H D. Appropriate volumes for adsorption isotherm studies: The absolute void volume, accessible pore volume and enclosing particle volume[J]. J Colloid Interface Sci, 2007, 316(2): 317-330.

BAGHERI N, ABEDI J. Adsorption of methane on corn cobs based activated carbon[J]. Chem Eng Res Des, 2011, 89(10): 2038-2043.

MURATA K, MIYAWAKI J, KANEKO K. A simple determination method of the absolute adsorbed amount for high pressure gas adsorption[J]. Carbon, 2003, 40(3): 425-428.

DO D D, DO H D. Adsorption of supercritical fluids in non-porous and porous carbons: Analysis of adsorbed phase volume and density[J]. Carbon, 2003, 41(9): 1777-1791.

FLORIAN O M. Determination of absolute adsorption in highly ordered porous media[J]. Surf Sci, 2009, 603(10/12): 1979-1984.

ALEJANDRO S, MARIO T. Thermal effect of the adsorption heat on an adsorbed natural gas storage and transportation systems[J]. Appl Thermal Eng, 2009, 29(13): 2617-2623.

YANG X D, ZHENG Q R, GU A Z, LU X S. Experimental studies of the performance of adsorbed natural gas storage system during discharge[J]. Appl Thermal Eng, 2005, 25(4): 591-601.

郑青榕, BIRKETT G, DO D D. 甲烷在活性炭上吸附的实验及理论分析[J]. 天然气化工, 2009, 34(1): 41-44. (ZHENG Qing-ron, BIRKETT G, DO D D. Theoretical and experimental analysis of methane adsorption on activated carbon[J]. Natural Gas Chemical Industry, 2009, 34(1): 41-44.)

LI M, GU A Z, LU X S, WANG R S. Determination of the adsorbate density from supercritical gas adsorption equilibrium data[J]. Carbon, 2003, 41(3): 585-588.

NIESZPOREK K. Potential theory approach as a powerful tool in theoretical prediction of mixed-gas adsorption equilibria and their accompanying calorimetric effects[J]. Chem Eng Sci, 2005, 60(10): 2763-2769.

SETZMANN U, WAGNER W J. A new EOS and tables of thermodynamic properties for methane covering the range from the melting line to 635K at pressures up to 1 000 MPa[J]. J Phys Chem Ref Data, 1991, 20(6): 1061-1156.

BIRKETT G, DO D D. New method to determine PSD using supercritical adsorption: Applied to methane adsorption in activated carbon[J]. Langmuir, 2006, 22(18): 7622-7630.

MENON P G. Adsorption at high pressures[J]. Chem Rev, 1968, 68(3): 277-294.

SANDLER S I. Chemical and engineering thermodynamics[M]. 3rd ed. New York: Wiley, 1999: 86-91.

MEEKS O R, RYBOLT T R. Correlations of adsorption energies with physical and structural properties of adsorbate molecules[J]. J Colloid Interface Sci, 1997, 196 (1): 103-109.

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