Peak fitting methods and parameter settings in XPS analysis for organic sulfur in coal

By analyzing the organic sulfur content in the model compounds and the Xinyu refined coking coal, the curve fitting methods and setting parameters of XPS spectra were discussed. The results indicate that when analyzing the content of different sulfur forms in coal with XPS, the curve fitting methods of 2p_3/2 and 2p_1/2 splitting peaks and some other parameters are set as follows: an approximate 2:1 relative area separated by 1.18 eV with equal L-G% and FWHM level. In addition, the 2p_3/2 peak of each organic sulfur is fixed as: mercaptan/thioether 162.1~163.6 eV, thiophene 164.0~164.4 eV, and sulfoxide 165.0~166.0 eV. Good reproducibility and fitting level are achieved when the curve fitting parameters are adjusted finely and dynamically within a certain range.