Adsorption characteristics of CH4 on activated carbon based on the dual-site Langmuir model

被引：0
|
作者：
Yue G. [1 ]
Wang L. [1 ]
Li M. [1 ]
Lin H. [1 ]
机构：
[1] School of Civil Engineering, Henan Polytechnic University, Jiaozuo, 454000, Henan
来源：
Natural Gas Industry | 2020年 / 40卷 / 04期
关键词：
Absolute adsorption; Absorbed natural gas (ANG); Accurate prediction; Activated carbon; Adsorption Quantity; Dual-site Langmuir model; Excess adsorption; Temperature;
D O I：
10.3787/j.issn.1000-0976.2020.04.016
中图分类号：
学科分类号：
摘要：
Compared with compressed natural gas (CNG) storage and LNG storage, adsorbed natural gas (ANG) is more advantageous with lower storage pressure and operation cost. To convert the measured adsorption quantity to the absolute adsorption quantity, however, it is necessary to adopt an appropriate model. To accurately predict the total methane storage on activated carbon, methane's adsorption behavior on activated carbon was predicted using the dual-site Langmuir model with the error no more than 5%. The critical point corresponding to the methane adsorption equilibrium on activated carbon under the temperature of 283.15 K - 323.15 K and the pressure of 0.1-14.0 MPa was interpreted. After the excess adsorption quantity was higher than the maximum value, crossover phenomenon occurred in the adsorption isotherm contours of different temperatures. And after the cross point, the excess adsorption quantity increased with the increase of temperature. The adsorbed phase volume and the gas phase density of methane changed with equilibrium temperature and pressure. The contribution of the volume-density term to the absolute adsorption quantity gradually became less as the temperature increased. Under less than 343.15 K and 14 MPa, the actual adsorbed methane accounted for more than 86.9%, the content of free methane phase was less than 13.1%, and the contribution rate of the content of free methane phase increased gradually with the increase of temperature.
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页码：125 / 132
页数：7
相关论文
共 36 条
  • [1] Biloe S., Goetz V., Mauran S., Characterization of adsorbent composite block for methane storage, Carbon, 39, 11, pp. 1653-1662, (2001)
  • [2] Wang Y., Ercan C., Khawajah A., Et al., Experimental and theoretical study of methane adsorption on granular activated carbons, AIChE Journal, 58, 3, pp. 782-788, (2012)
  • [3] Namvar A.M., Soltanieh M., Rashidi A., Modeling and preparation of activated carbon for methane storage(II): Neural network modeling and experimental studies of the activated carbon preparation, Energy Conversion & Management, 49, 9, pp. 2478-2482, (2008)
  • [4] Kazi R.A., Anutosh C., Bidyut B.S., On thermodynamics of methane + carbonaceous materials adsorption, International Journal of Heat & Mass Transfer, 55, 4, pp. 565-573, (2012)
  • [5] Zhong R., Zhang Y., Study on adsorption capacity of CH<sub>4</sub>/N<sub>2</sub> on activated carbon, Chemical Engineering of Oil & Gas, 47, 3, pp. 17-20, (2018)
  • [6] Li M., Gu A.Z., Lu X.S., Et al., Determination of the adsorbate density from supercritical gas adsorption equilibrium data, Carbon, 41, 3, pp. 585-588, (2003)
  • [7] Birkett G., Do D.D., New method to determine PSD using supercritical adsorption: Applied to methane adsorption in activated carbon, Langmuir, 22, 18, pp. 7622-7630, (2006)
  • [8] Gregg S.J., Sing K.S.W., Adsorption Surface Area and Porosity, (1982)
  • [9] Murata K., Miyawaki J., Kaneko K., A simple determination method of the absolute adsorbed amount for high pressure gas adsorption, Carbon, 40, 3, pp. 425-428, (2003)
  • [10] Do D.D., Do H.D., Adsorption of supercritical fluids in non-porous and porous carbons: Analysis of adsorbed phase volume and density, Carbon, 41, 9, pp. 1777-1791, (2003)
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