Abstract：A large number of environmental pollutants were produced by coal buring, and the atmosphere was seriously polluted by sulfur dioxide. In order to reduce the hidden danger and environmental pollution caused by the traditional desulfurization methods, and to improve the removal rate of organic sulfur in coal buring as much as possible, the ionic liquid namely 1-butyl-3-methyl imidazolium bisulfate ( [Bmim][HSO4]) was used together with 30% H₂O₂to remove the sulfur in coal. The sulfur content tests, infrared spectrum and X-ray experiments were taken to test the functional group and microstructure of raw coal samples and treated coal samples. The results indicated that H₂O₂-[Bmim][HSO4]solution could remove the sulfur by 47. 44%, significantly better than only H₂O₂by 38. 61%. FTIR spectra showed that IL-H₂O₂performed better than only H₂O₂in respect of the removal of organic —SH and —S—S—. Besides, XPS was applied to measure the form of sulfur in coal, and the results also showed that IL-H₂O₂removed most of thiol/thioether and partially thiophene and sulfone/sulfoxide. All the experimental results showed that the addition of[Bmim][HSO4]ionic liquids into H₂O₂improved the oxidative desulfurization of coal, which was caused by an enhanced oxidation of organic sulfur in H₂O₂due to destruction of hydrogen-bonding networks and dissolution of small molecular structures of coal in ionic liquids.

Keyword：coal desulfurization method;ionic liquids;hydrogen peroxide;desulfurization rate;