Next Article in Journal
In Vivo and In Vitro Toxicity Evaluation of Polyprenols Extracted from Ginkgo biloba L. Leaves
Previous Article in Journal
Correction: Zhang, Y., et al. Clones of FeSOD, MDHAR, DHAR Genes from White Clover and Gene Expression Analysis of ROS-Scavenging Enzymes during Abiotic Stress and Hormone Treatments. Molecules 2015, 20, 20939–20954
Open AccessArticle

Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds

by Lanjun Zhang 1,2, Zenghua Li 1,2,*, Jinhu Li 1,2, Yinbo Zhou 1,2, Yongliang Yang 1,2 and Yibo Tang 3
Key Laboratory of Coal Methane and Fire Control, Ministry of Education, China University of Mining and Technology, Xuzhou 221008, China
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
College of Mining Technology, Taiyuan University of Technology, Taiyuan 030024, China
Author to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Molecules 2015, 20(12), 22241-22256;
Received: 19 October 2015 / Revised: 2 December 2015 / Accepted: 3 December 2015 / Published: 11 December 2015
(This article belongs to the Section Organic Chemistry)
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. View Full-Text
Keywords: coal; organic sulfur; model compounds; low-temp oxidation; XPS coal; organic sulfur; model compounds; low-temp oxidation; XPS
Show Figures

Figure 1

MDPI and ACS Style

Zhang, L.; Li, Z.; Li, J.; Zhou, Y.; Yang, Y.; Tang, Y. Studies on the Low-Temp Oxidation of Coal Containing Organic Sulfur and the Corresponding Model Compounds. Molecules 2015, 20, 22241-22256.

Show more citation formats Show less citations formats

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop