Abstract:

In this paper, the changes of sulfur chemical forms in coal before and after desulfurization were analysed by XPS. The results show that, the sulphur exists in coal in the forms of thiophene、sulfoxide（S=O）、mercaptan（sulfoether）and sulfate. After desulfurization by microwave, the contents of thiophene sulfur and mercaptan（sulfoether）sulfur decreased, and basically the mercaptan was removed completely. Meanwhile, the content of sulfoxide sulfur increased slightly, and the content of sulfate sulfur increased by a large margin. The sulphur in coal tends to transform into its oxidation state.