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Thermodynamic properties of high-rank tectonically deformed coals during isothermal adsorption

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Abstract

The adsorption capacity and thermodynamic properties of high-rank tectonically deformed coal (TDC) samples from the Yangquan coalfield in North China were analyzed by combining isothermal adsorption and Polanyi potential theory. The adsorption capacities of mylonitic- (10.7015–17.2065 cm3/g) and scaly (9.8237–11.5386 cm3/g) coals are higher than those of cataclastic- (8.3496–9.5238 cm3/g) and schistose (7.7990–8.0467 cm3/g) coals. The primary- and wrinkle coals have the lowest adsorption capacities. The adsorption potential (the change of surface free energy per mole during physical adsorption) decreases with the increasing adsorption space in a parabola characteristic. For different TDCs, the interval length of the adsorption potential distribution is in the same order with the adsorption capacity. The interval lengths of primary-, schistose-, and mylonitic coals are 0–0.014, 0–0.020, and 0–0.025 cm3/g, respectively. The reduction amounts of surface free energy for mylonitic- (6.040–10.082 kJ/cm2) and scaly (2.075–6.047 kJ/cm2) coals are higher than those of the cataclastic- (3.069–4.249 kJ/cm2) and wrinkle (2.222–3.434 kJ/cm2) coals. The initial and saturated adsorption surface free energies of mylonitic- and scaly coals are higher than those of the primary- and schistose coals. Based on the difference in the surface free energy reduction values, the TDCs, especially the mylonitic- and scaly coals, have a greater adsorption potential than primary- and other TDCs.

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Acknowledgements

This paper was supported by the National Natural Science Foundation of China (No. 51468047).

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Authors and Affiliations

  1. School of Resources and Earth Science, China University of Mining & Technology, Xuzhou, 221116, China

    Junhong Yuan, Yuliang Guo & Nian Cai

  2. Highway Engineering Test Center, Inner Mongolia University, Huhehot, Xuzhou, 010070, China

    Junhong Yuan & Hong Zhang

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  1. Junhong Yuan
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  2. Hong Zhang
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  3. Yuliang Guo
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  4. Nian Cai
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Correspondence to Junhong Yuan.

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Yuan, J., Zhang, H., Guo, Y. et al. Thermodynamic properties of high-rank tectonically deformed coals during isothermal adsorption. Arab J Geosci 10, 278 (2017). https://doi.org/10.1007/s12517-017-3066-1

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