Liu Yanhua,Che defu,Xu Tongmo
(School of Energy and Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)
Abstract:The sulfur forms in Yibin coal and its residues produced during de-volatilization were determined by X-ray photoelectron spectroscopy (XPS).The S 2p spectrum of the coal-indicates that the sulfur in the coal studied can be detected by XPS. There are two clear peaks located at 163-164eV and 169-171 eV respectively.The peak between 163-164 eV is caused mainly by pyrite, and that between 169-171 eV caused by sulfates.There are sulfones but no sulfoxides in the coal.The determination of residues shows that a part of sulfur is transformed to sulfates or sulfites during de-volatilization at 900 ¡æ and then kept in the residues. At the same time,some of coal sulfur is released as volatiles,the fraction of which depends on temperature and increases with temperature increasing.
Keywords:X-ray photoelectron spectroscopy;coal sulfur;char