Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds
This paper selects two typical compounds containing organic sulfur as model compounds. Then, by analyzing the chromatograms of gaseous low-temp oxidation products and GC/MS of the extractable matter of the oxidation residue, we summarizing the mechanism of low-temp sulfur model compound oxidation. T...
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MDPI AG
2015-12-01
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| Series: | Molecules |
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| Online Access: | http://www.mdpi.com/1420-3049/20/12/19843 |
| _version_ | 1811344142652932096 |
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| author | Lanjun Zhang Zenghua Li Jinhu Li Yinbo Zhou Yongliang Yang Yibo Tang |
| author_facet | Lanjun Zhang Zenghua Li Jinhu Li Yinbo Zhou Yongliang Yang Yibo Tang |
| author_sort | Lanjun Zhang |
| collection | DOAJ |
| description | This paper selects two typical compounds containing organic sulfur as model compounds. Then, by analyzing the chromatograms of gaseous low-temp oxidation products and GC/MS of the extractable matter of the oxidation residue, we summarizing the mechanism of low-temp sulfur model compound oxidation. The results show that between 30 °C to 80 °C, the interaction between diphenyl sulfide and oxygen is mainly one of physical adsorption. After 80 °C, chemical adsorption and chemical reactions begin. The main reaction mechanism in the low-temp oxidation of the model compound diphenyl sulfide is diphenyl sulfide generates diphenyl sulfoxide, and then this sulfoxide is further oxidized to diphenyl sulphone. A small amount of free radicals is generated in the process. The model compound cysteine behaves differently from diphenyl sulfide. The main reaction low-temp oxidation mechanism involves the thiol being oxidized into a disulphide and finally evolving to sulfonic acid, along with SO2 being released at 130 °C and also a small amount of free radicals. We also conducted an experiment on coal from Xingcheng using X-ray photoelectron spectroscopy (XPS). The results show that the major forms of organic sulfur in the original coal sample are thiophene and sulfone. Therefore, it can be inferred that there is none or little mercaptan and thiophenol in the original coal. After low-temp oxidation, the form of organic sulfur changes. The sulfide sulfur is oxidized to the sulfoxide, and then the sulfoxide is further oxidized to a sulfone, and these steps can be easily carried out under experimental conditions. What’s more, the results illustrate that oxidation promotes sulfur element enrichment on the surface of coal. |
| first_indexed | 2024-04-13T19:42:30Z |
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| id | doaj.art-b4f004e3caf541d3be53793cb50cf449 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-04-13T19:42:30Z |
| publishDate | 2015-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Molecules |
| spelling | doaj.art-b4f004e3caf541d3be53793cb50cf4492022-12-22T02:32:50ZengMDPI AGMolecules1420-30492015-12-012012222412225610.3390/molecules201219843molecules201219843Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model CompoundsLanjun Zhang0Zenghua Li1Jinhu Li2Yinbo Zhou3Yongliang Yang4Yibo Tang5Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, ChinaKey Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, ChinaKey Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, ChinaKey Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, ChinaKey Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, ChinaCollege of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, ChinaThis paper selects two typical compounds containing organic sulfur as model compounds. Then, by analyzing the chromatograms of gaseous low-temp oxidation products and GC/MS of the extractable matter of the oxidation residue, we summarizing the mechanism of low-temp sulfur model compound oxidation. The results show that between 30 °C to 80 °C, the interaction between diphenyl sulfide and oxygen is mainly one of physical adsorption. After 80 °C, chemical adsorption and chemical reactions begin. The main reaction mechanism in the low-temp oxidation of the model compound diphenyl sulfide is diphenyl sulfide generates diphenyl sulfoxide, and then this sulfoxide is further oxidized to diphenyl sulphone. A small amount of free radicals is generated in the process. The model compound cysteine behaves differently from diphenyl sulfide. The main reaction low-temp oxidation mechanism involves the thiol being oxidized into a disulphide and finally evolving to sulfonic acid, along with SO2 being released at 130 °C and also a small amount of free radicals. We also conducted an experiment on coal from Xingcheng using X-ray photoelectron spectroscopy (XPS). The results show that the major forms of organic sulfur in the original coal sample are thiophene and sulfone. Therefore, it can be inferred that there is none or little mercaptan and thiophenol in the original coal. After low-temp oxidation, the form of organic sulfur changes. The sulfide sulfur is oxidized to the sulfoxide, and then the sulfoxide is further oxidized to a sulfone, and these steps can be easily carried out under experimental conditions. What’s more, the results illustrate that oxidation promotes sulfur element enrichment on the surface of coal.http://www.mdpi.com/1420-3049/20/12/19843coalorganic sulfurmodel compoundslow-temp oxidationXPS |
| spellingShingle | Lanjun Zhang Zenghua Li Jinhu Li Yinbo Zhou Yongliang Yang Yibo Tang Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds Molecules coal organic sulfur model compounds low-temp oxidation XPS |
| title | Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds |
| title_full | Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds |
| title_fullStr | Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds |
| title_full_unstemmed | Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds |
| title_short | Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds |
| title_sort | studies on the low temp oxidation of coal containing organic sulfur and the corresponding model compounds |
| topic | coal organic sulfur model compounds low-temp oxidation XPS |
| url | http://www.mdpi.com/1420-3049/20/12/19843 |
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