Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation
The coal structure deformation attributed to actions of tectonic stresses can change characteristics of nanopore structure of coals, affecting their CO<sub>2</sub> adsorption. Three tectonically deformed coals and one undeformed coal were chosen as the research objects. The isotherm adso...
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MDPI AG
2020-07-01
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| Online Access: | https://www.mdpi.com/2076-3417/10/14/4997 |
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| author | Linlin Wang Zhengjiang Long |
| author_facet | Linlin Wang Zhengjiang Long |
| author_sort | Linlin Wang |
| collection | DOAJ |
| description | The coal structure deformation attributed to actions of tectonic stresses can change characteristics of nanopore structure of coals, affecting their CO<sub>2</sub> adsorption. Three tectonically deformed coals and one undeformed coal were chosen as the research objects. The isotherm adsorption experiments of four coal specimens were carried out at the temperature of 35 °C and the pressure of 0 to 7 MPa. Nanopore structures were characterized using the liquid nitrogen adsorption method. The results show that there exist maximum values of excess and absolute adsorption capacity, which increase with increasing coal deformation degree. As the degree of coal deformation increases, the pore volume and specific surface area present an obvious increasing trend in the case of micropores, exhibiting an increase at first (cataclastic coal and ganulitic coal) and then stabilization (crumple coal), in the case of mesopores, and showing a gradual decrease in the case of macropores. The mesopores are the key factor of CO<sub>2</sub> adsorption of tectonically deformed coals, followed by the micropores and the limited effect of macropores at the strong coal deformation stage. |
| first_indexed | 2024-03-10T18:20:23Z |
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| last_indexed | 2024-03-10T18:20:23Z |
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| spelling | doaj.art-f6810c5c99c84b11a7ced450b46ee7302023-11-20T07:23:43ZengMDPI AGApplied Sciences2076-34172020-07-011014499710.3390/app10144997Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure DeformationLinlin Wang0Zhengjiang Long1Jiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, ChinaJiangsu Key Laboratory of Coal-Based Greenhouse Gas Control and Utilization, Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou 221008, ChinaThe coal structure deformation attributed to actions of tectonic stresses can change characteristics of nanopore structure of coals, affecting their CO<sub>2</sub> adsorption. Three tectonically deformed coals and one undeformed coal were chosen as the research objects. The isotherm adsorption experiments of four coal specimens were carried out at the temperature of 35 °C and the pressure of 0 to 7 MPa. Nanopore structures were characterized using the liquid nitrogen adsorption method. The results show that there exist maximum values of excess and absolute adsorption capacity, which increase with increasing coal deformation degree. As the degree of coal deformation increases, the pore volume and specific surface area present an obvious increasing trend in the case of micropores, exhibiting an increase at first (cataclastic coal and ganulitic coal) and then stabilization (crumple coal), in the case of mesopores, and showing a gradual decrease in the case of macropores. The mesopores are the key factor of CO<sub>2</sub> adsorption of tectonically deformed coals, followed by the micropores and the limited effect of macropores at the strong coal deformation stage.https://www.mdpi.com/2076-3417/10/14/4997CO<sub>2</sub> adsorptionnanoporecoal structure deformationtectonically deformed coal |
| spellingShingle | Linlin Wang Zhengjiang Long Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation Applied Sciences CO<sub>2</sub> adsorption nanopore coal structure deformation tectonically deformed coal |
| title | Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation |
| title_full | Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation |
| title_fullStr | Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation |
| title_full_unstemmed | Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation |
| title_short | Evolutions of CO<sub>2</sub> Adsorption and Nanopore Development Characteristics during Coal Structure Deformation |
| title_sort | evolutions of co sub 2 sub adsorption and nanopore development characteristics during coal structure deformation |
| topic | CO<sub>2</sub> adsorption nanopore coal structure deformation tectonically deformed coal |
| url | https://www.mdpi.com/2076-3417/10/14/4997 |
| work_keys_str_mv | AT linlinwang evolutionsofcosub2subadsorptionandnanoporedevelopmentcharacteristicsduringcoalstructuredeformation AT zhengjianglong evolutionsofcosub2subadsorptionandnanoporedevelopmentcharacteristicsduringcoalstructuredeformation |