Effect of particle size on CO adsorption and thermodynamic analysis |
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| Institution: | 1. School of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an, Shaanxi, 710054, China;2. Yanzhou Coal Industry Co., Ltd., Shandong, 272000, China;3. Graduate School of Engineering Science and Technology, National Yunlin University of Science and Technology, Douliou, Yunlin, 64002, Taiwan;1. College of Safety Science and Engineering, Nanjing Tech University, Nanjing, 211816, Jiangsu, China;2. Department of Safety, Health, and Environmental Engineering, School of Engineering, National Yunlin University of Science and Technology, Douliou, Yunlin, 64002, Taiwan;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Faculty of Technology, Policy and Management, Safety and Security Science Group (S3G), TU Delft, 2628 BX, Delft, the Netherlands;3. Faculty of Applied Economics, Antwerp Research Group on Safety and Security (ARGoSS), Universiteit Antwerpen, 2000, Antwerp, Belgium;4. CEDON, KULeuven, 1000, Brussels, Belgium;1. College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao, 266580, China;2. Saifeite Engineering Group Co. Ltd., Qingdao, 266061, China;3. Department of Safety, Health, And Environmental Engineering, National Yunlin University of Science and Technology, Yunlin, 64002, Taiwan, ROC;1. Institute of Safety Science and Engineering, South China University of Technology, Guangzhou, 510640, China;2. Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia;3. Institute of Ocean and Earth Sciences, C308, Institute for Advanced Studies Building, University of Malaya, 50603, Kuala Lumpur, Malaysia;4. Centre for Dryland Agriculture, Bayero University, P.M.B. 3011, Kano, Nigeria |
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| Abstract: | The liquid nitrogen adsorption method was used to characterize the pore structure of non-cohesive coal in the 061,404 working face of the Lingxin coal mine. The amount of specific surface area of micropores in the sample continuously rose as particle sizes reduced. The volumetric method was used to measure the CO isothermal adsorption curves of three samples (sample I, 0.425–0.25 mm, sample II, 0.18–0.25 mm, and sample III, 0.15–0.18 mm). The experimental results were fitted by the Langmuir model. According to the experimental results, it was conducive to CO adsorption with the conditions of high pressure and low-temperature. The decrease in grain diameter increased the number and volume of micropores in the sample, which improved the adsorption capacity of the sample. In addition, according to the adsorption data, the CO adsorption thermodynamics of three samples were analyzed, including surface potential (Ω), Gibbs free energy change (ΔG) and entropy change (ΔS). The results demonstrated that CO adsorption by coal was a spontaneous process. Sample III has the most substantial adsorption capacity, whereas the sample I has the weakest adsorption capacity. |
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| Keywords: | Liquid nitrogen adsorption method Specific surface area CO isothermal adsorption curves Langmuir mode Spontaneous process |
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