W. Li et Sc. Guo, THE VARIATION OF SULFUR FORMS IN SUPERCRITICAL DESULFURIZATION OF COAL WITH ETHANOL, Fuel science & technology international, 14(5), 1996, pp. 651-667
Using Mossbauer and X-ray Photoelectron Spectroscopy (XPS) techniques
the sulfur forms in solid products obtained at different reaction were
analyzed. The results show that: during supercritical desulfurization
the pyritic sulfur is removed as following process: FeS2-->FeS+Fe1-xS
, the transformation amounts and the value of x are dependent on react
ion conditions, especially on temperature. The conversion of pyrite is
very little at 275 degrees C. Pyrrhotite (Fe1-xS) is FeS1.101 at 275
degrees C and FeS1.085 at 450 degrees C. Among the organic sulfur grou
ps PhSH. Ph(2)S and thiolane are easily removed; Ph(2)SO is more diffi
cult to be removed, its removal may be realized by increasing temperat
ure and adding some water into ethanol; thiophene is most difficult to
be removed, its removal needs high reaction temperature.