Kinetic fitting of methane adsorption rate and its influencing factors

Zhen Yu

doi:10.54097/ije.v2i2.6192

Authors

Zhen Yu

DOI:

https://doi.org/10.54097/ije.v2i2.6192

Keywords:

Adsorption rate, Adsorption kinetics, Fick diffusion, Knudsen diffusion

Abstract

In order to reveal the mechanism of the influence of coal matrix pores on methane adsorption rate, based on the high-pressure methane isothermal adsorption experiment of coal samples with different pore structures, the desorption law of methane in coal and its internal relationship with pore structure were studied by analyzing the change of methane adsorption amount at a single pressure point over time. Bangham kinetic model was used to fit the adsorption process, and constants representing the adsorption rate were obtained. The following understandings were obtained: (1) With the decrease of particle size, the adsorption equilibrium time is shorter, small particle size samples often have more complex pore structure, which makes the adsorption reaction between gas-solid interface more active, but the particle size itself cannot increase or reduce the size of the accumulated adsorption amount at the equilibrium, it only changes the length of time required to reach the adsorption equilibrium. (2) With the increase of the mesh number, the adsorption rate also increases, but the higher the coal rank, the greater the adsorption rate growth rate.

Downloads

Download data is not yet available.

References

Clarkson C,Bustin R. The Effect of Pore Structure and Gas Pressure Upon the Transport Properties of Coal: a Laboratory and Modeling Study. 1. Isotherms and Pore Volume Distributions[J]. Fuel, 1999, 78(11): 1345-1362.

JIANG Jingyu, CHENG Yuanping, et al. Quantitative characterization of pore structure and gas adsorption and diffusion properties of low-rank coal [J]. Journal of China Coal Society., 2021, 46(10): 3221-3233.

YANG Ming, LIU Lei, et al. Study on joint characterization of pore structure of middle-rank coal by nitrogen adsorption-mercury intrusion-NMR [J]. Coal Science and Technology., 2021, 49(5): 67-74.

LIU ShiQi, WANG He, et al. Research Advances on Characteristics of Pores and Fractures in Coal Seams [J]. Acta Sedimentologica Sinica, 2021, 39(1): 212-230.

Wang Jianhua, Liang Yongping. Study on CBM Hosting Features in Hongsan Minefield, Hongdunzi Mining Area, Yinchuan City, Ningxia [J]. Coal Geology of China, 2021, 33(10): 48-52.

Yang Yinghua, Xu Ying, et al. Occurrence characteristics of coalbed methane and its parameter well and design of drainage well [J]. China Energy and Environmental Protection, 2021, 43(10): 128-135.

Wang Chenlong, Han Jinliang, Liu Yishan, et al. Research status and development trend analysis of key technologies of coalbed methane development project [J]. Engineering and Technological Research., 2021, 6(3): 247-248.

Milewska-duda Janina,Duda Jan,Nodzeñski Adam,etc. Absorption and Adsorption of Methane and Carbon Dioxide in Hard Coal and Active Carbon[J]. American Chemical Society (ACS)(12): 5458-5466.

Zhang Qun, Yang Xilu. Isothermal adsorption of coals on methane under equilibrium moisture [J]. Journal of China Coal Society., 1999(6): 566-570.

Zhou Li, Li Ming, Zhou Yaping. Adsorption measurement and theoretical analysis of supercritical methane on high surface activated carbon [J]. Science in China, Ser.B, 2000(1): 49-56.

Ahmad A.A., Hameed B.H., Aziz N.. Adsorption of direct dye on palm ash: Kinetic and equilibrium modeling[J]. Journal of Hazardous Materials, 141(1): 70-76.

Aksu Z. Biosorption of Reactive Dyes By Dried Activated Sludge: Equilibrium and Kinetic Modelling[J]. Biochemical Engineering Journal, 7(1): 79-84.

Ho Y, Mckay G. Pseudo-second Order Model for Sorption Processes[J]. Process Biochemistry, 34(5): 451-465.

Zhou Zunlong, Lu Yuan, Sun Hongwen. Sorption Kinetics and Isotherms of Phenanthrene in Charcoals with Different Properties [J]. Journal of Agro-Environment Science., 2010, 29(3): 476-480.

Weber Walter-J.,Morris J.-Carrell. Kinetics of Adsorption on Carbon from Solution[J]. American Society of Civil Engineers (ASCE), 1(2): 31-59.

A Vernadakis. Zur Theorie der sogenannten Adsorption gelöster Stoffe[J]. Springer Science and Business Media LLC (1): 15-15.

Qin Yueping, Wang Jian, Luo Wei, et al. Experiment of dynamic gas desorption under constant pressure [J]. Journal of Liaoning Technical University (Natural Science)., 2012, 31(5): 581-585.

Jiang Zhaolong, Zhou Yujun, Liu Wei, et al. Study on empirical formula and heterogeneity for adsorption rate of CO2,N2 and CH4 by coal [J]. Journal of Safety Science and Technology, 2020, 16(9): 83-88.

Changchun Wang Shengli Guo Jingyang et al. Adsorption kinetics and mechanism of copper ion on biochar with different pyrolysis condition [J]. Acta Scientiae Circumstantiae, 2016, 36(7): 2491-2502.

Ma Fengfeng, Zhao Baowei, Diao Jingru, et al. Ammonium Adsorption Characteristics in Aqueous Solution by Dairy Manure Biochar [J]. Environmental Science, 2015, 36(5): 1678-1685.

Han Zhiyang. Model Predictive Control of Vacuum Pressure Swing Adsorption Process [D]. Tianjin University, 2018.

He Xueqiu, Nie Baisheng. Diffusion Mechanism of Porous Gases in Coal Seams [J]. Journal of China University of Mining ＆ Technology., 2001(1): 3-6.

Hibi Yoshihiko. Method for obtaining the Knudsen diffusion coefficient[J]. MethodsX, 2018: 959-972.

Wu H,Yao Y,Liu D, et al. An Analytical Model for Coalbed Methane Transport Through Nanopores Coupling Multiple Flow Regimes [J]. Journal of Nature Gas Science and Engineering, 82: 103500.

Bangham d h Sever-W. An experimental investigation of the dynamical equation of the process of gas-sorption. [J]. Philosophical Magazine and Journal of Science, 1925, 49(6): 935-944.

Crank J. The mathematics of diffusion[M]. New York: Oxford University Press, 1975: 44-69.

Rouquerol J,Avnir D,Fairbridge CW, et al. Recommendations for the Characterization of Porous Solids[DS]: De Gruyter, 2016.

Liu Shengdong. Experimental Study on Methane Adsorption Characteristics of Coal and Its Influence Factor Analysis [D]. Chongqing University, 2017.

Zhang Li, He Xueqiu, Wang Enyuan, et al. Study of Absorptive Characteristics of Coal [J]. Journal of Taiyuan University of Technology, 2001(5): 449-451.

Clarkson C.R.,Bustin R.M.. Binary gas adsorption/desorption isotherms: effect of moisture and coal composition upon carbon dioxide selectivity over methane[J]. International Journal of Coal Geology, 42(4): 241-271.