Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins
Abundant in northwest China, tar-rich coal exhibits significantly diverse pyrolysis behaviors depending on its origins. For low-temperature pyrolysis experiments, three coal-forming environments were selected: limno-telmatic (Sample S-1), wet forest swamp (Sample O-1), and dry forest swamp (Sample O...
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Elsevier
2025-04-01
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| Series: | Fuel Processing Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0378382025000050 |
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| author | Qingmin Shi Xinyue Zhao Shuangming Wang Hongchao Zhao Ruijun Ji Chunhao Li Bingyang Kou Jun Zhao |
| author_facet | Qingmin Shi Xinyue Zhao Shuangming Wang Hongchao Zhao Ruijun Ji Chunhao Li Bingyang Kou Jun Zhao |
| author_sort | Qingmin Shi |
| collection | DOAJ |
| description | Abundant in northwest China, tar-rich coal exhibits significantly diverse pyrolysis behaviors depending on its origins. For low-temperature pyrolysis experiments, three coal-forming environments were selected: limno-telmatic (Sample S-1), wet forest swamp (Sample O-1), and dry forest swamp (Sample O-2). The pyrolysis behavior and the molecular structure evolution were analyzed through thermogravimetric, Fourier transform infrared spectroscopy, gas chromatography, and gas chromatography-mass spectrometer. The findings revealed three stages of pyrolysis behavior in tar-rich coal. Compared to others, S-1, formed in a stronger reducing environment, had a 17 °C lower initial pyrolysis temperature, a 5 °C lower peak reaction temperature, and a 20 % higher weight loss. The reason for S-1 had more bonds with lower energies, accounting for 76 % of the total fragmented bonds, which was 10 % higher than others. Moreover, S-1 contained more highly reactive molecular structures and exhibited higher thermal decomposition. The variations in molecular structure and pyrolysis behavior were reflected in the pyrolysis products, with S-1 showing higher yields of tar, gas, and water, but lower semi-coke. Specifically, it had 2 % higher aliphatics and aromatics and 4 % fewer oxygenated compounds, along with higher levels of CO and CO2, and lower amounts of H2, CH4, and CnHm in volatiles. |
| format | Article |
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| institution | Kabale University |
| issn | 0378-3820 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Fuel Processing Technology |
| spelling | doaj-art-fddadbad02a845b2af3a8dff1e156b5f2025-02-09T04:59:41ZengElsevierFuel Processing Technology0378-38202025-04-01268108181Differences in pyrolysis behavior and volatiles of tar-rich coal with various originsQingmin Shi0Xinyue Zhao1Shuangming Wang2Hongchao Zhao3Ruijun Ji4Chunhao Li5Bingyang Kou6Jun Zhao7Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, China; Xi'an University of Science and Technology, the Belt and Road Energy Research Institute of Xinjiang, Urumqi 830000, China; Corresponding author at: Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, China.Shaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, ChinaShaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, ChinaShaanxi Coal Chemical Industry Technology Research Institute Co., Ltd., Xi'an 710100, ChinaShaanxi Coal Chemical Industry Technology Research Institute Co., Ltd., Xi'an 710100, ChinaShaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, ChinaShaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, ChinaShaanxi Provincial Key Laboratory of Geological Support for Coal Green Exploitation, Xi'a University of Science and Technology, Xi'an 710054, ChinaAbundant in northwest China, tar-rich coal exhibits significantly diverse pyrolysis behaviors depending on its origins. For low-temperature pyrolysis experiments, three coal-forming environments were selected: limno-telmatic (Sample S-1), wet forest swamp (Sample O-1), and dry forest swamp (Sample O-2). The pyrolysis behavior and the molecular structure evolution were analyzed through thermogravimetric, Fourier transform infrared spectroscopy, gas chromatography, and gas chromatography-mass spectrometer. The findings revealed three stages of pyrolysis behavior in tar-rich coal. Compared to others, S-1, formed in a stronger reducing environment, had a 17 °C lower initial pyrolysis temperature, a 5 °C lower peak reaction temperature, and a 20 % higher weight loss. The reason for S-1 had more bonds with lower energies, accounting for 76 % of the total fragmented bonds, which was 10 % higher than others. Moreover, S-1 contained more highly reactive molecular structures and exhibited higher thermal decomposition. The variations in molecular structure and pyrolysis behavior were reflected in the pyrolysis products, with S-1 showing higher yields of tar, gas, and water, but lower semi-coke. Specifically, it had 2 % higher aliphatics and aromatics and 4 % fewer oxygenated compounds, along with higher levels of CO and CO2, and lower amounts of H2, CH4, and CnHm in volatiles.http://www.sciencedirect.com/science/article/pii/S0378382025000050Tar-rich coalLow-temperature pyrolysisCoal-forming environmentPyrolysis behaviorPyrolysis products |
| spellingShingle | Qingmin Shi Xinyue Zhao Shuangming Wang Hongchao Zhao Ruijun Ji Chunhao Li Bingyang Kou Jun Zhao Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins Fuel Processing Technology Tar-rich coal Low-temperature pyrolysis Coal-forming environment Pyrolysis behavior Pyrolysis products |
| title | Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins |
| title_full | Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins |
| title_fullStr | Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins |
| title_full_unstemmed | Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins |
| title_short | Differences in pyrolysis behavior and volatiles of tar-rich coal with various origins |
| title_sort | differences in pyrolysis behavior and volatiles of tar rich coal with various origins |
| topic | Tar-rich coal Low-temperature pyrolysis Coal-forming environment Pyrolysis behavior Pyrolysis products |
| url | http://www.sciencedirect.com/science/article/pii/S0378382025000050 |
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