Effect of Inhibitors on Hydrogen Bond Reduction and Kaolinite Dissolution for Enhanced CO(2) Adsorption in Coal.
Effect of Inhibitors on Hydrogen Bond Reduction and Kaolinite Dissolution for Enhanced CO(2) Adsorption in Coal.
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DOI：
10.1021/acsomega.3c05153
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发表时间：
2023-11-14
期刊：
影响因子：
4.1
通讯作者：
Xiao, Li-na
中科院分区：
文献类型：
--
作者：
Sun, Rui-jie;Yan, E-chuan;Liu, Wan-li;Ling, Jia-yu;Xiao, Li-na
对采空区残留煤应用阻化剂，既防止了矿区煤层自燃，又大大提高了煤吸附CO2的能力。为探讨缓蚀剂提高采空区煤层CO2吸附能力的机理，采用溶胀实验、红外光谱、扫描电镜和X射线衍射分析等方法，研究缓蚀剂缓蚀前后CO2吸附的微观结构变化。结果表明，抑制后，煤大分子之间的氢键数量减少，样品表现出约5%的溶胀。这种煤大分子结构的膨胀和煤颗粒之间的距离增加为CO2封存创造了额外的空间，这是有助于提高煤的CO2吸附能力的关键因素。煤的矿物组成由75.6%的高岭石组成，并且抑制导致高岭石含量减少0.8- 7.9%。抑制后高岭石的溶胀和崩解引起不均匀应力，导致孔结构发生变化。高岭石充填的封闭孔隙转变为开放孔隙，原有孔隙破裂，形成新的孔隙和孔道。高岭石颗粒的溶解增加了煤的孔隙度，进一步促进了气体吸附。在测试的三种抑制剂中，最有效的是尿素溶液，在提高矿区烟煤的CO2封存。该研究对提高采空区残煤固碳能力具有重要意义。
The application of an inhibitor to the remaining coal in the goaf not only prevents spontaneous combustion of the coal seam in the mining area but also greatly enhances the capacity of coal to adsorb CO2. To investigate the mechanism by which inhibitors improve the CO2 adsorption capacity of the coal seam in the goaf, we conducted swelling experiments, infrared spectroscopy, scanning electron microscopy, and X-ray diffraction analyses to examine the microstructural changes in the adsorption of CO2 before and after inhibition. The results indicate that after inhibition, the number of hydrogen bonds between coal macromolecules decreased, and the samples exhibited approximately 5% swelling. This swelling of the coal macromolecular structure and the increased distance between coal particles create additional space for CO2 sequestration, which is a critical factor contributing to the enhanced CO2 adsorption capacity of coal. The mineral composition of coal consists of 75.6% kaolinite, and inhibition leads to a reduction in kaolinite content by 0.8–7.9%. After inhibition, the swelling and disintegration of kaolinite cause uneven stress, resulting in changes to the pore structure. Closed pores filled with kaolinite transform into open pores, and the original pores crack, forming new pores and pore channels. The dissolution of kaolinite particles increases the porosity of the coal, further facilitating gas adsorption. Among the three inhibitors tested, the most effective in enhancing CO2 sequestration by bituminous coal in the mining area was the urea solution. This study holds significant importance in improving the CO2 sequestration capacity of residual coal in goaves.
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