LIU Fen-Rong, LI Wen, GUO Hui-Qing, LI Bao-Qiang, BAI Zong-Qing, HU Rui-Sheng. XPS study on the change of carbon-containing groups and sulfur transformation on coal surface[J]. Journal of Fuel Chemistry and Technology, 2011, 39(02): 81-84.
Citation:
LIU Fen-Rong, LI Wen, GUO Hui-Qing, LI Bao-Qiang, BAI Zong-Qing, HU Rui-Sheng. XPS study on the change of carbon-containing groups and sulfur transformation on coal surface[J]. Journal of Fuel Chemistry and Technology, 2011, 39(02): 81-84.
LIU Fen-Rong, LI Wen, GUO Hui-Qing, LI Bao-Qiang, BAI Zong-Qing, HU Rui-Sheng. XPS study on the change of carbon-containing groups and sulfur transformation on coal surface[J]. Journal of Fuel Chemistry and Technology, 2011, 39(02): 81-84.
Citation:
LIU Fen-Rong, LI Wen, GUO Hui-Qing, LI Bao-Qiang, BAI Zong-Qing, HU Rui-Sheng. XPS study on the change of carbon-containing groups and sulfur transformation on coal surface[J]. Journal of Fuel Chemistry and Technology, 2011, 39(02): 81-84.
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China;
2.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China;
Funds:
The PH.D Project of Natural Science Foundation of Inner Mongolia (2009BS0606) and the Key Project of Natural Science Foundation of China (21006042)
Two Chinese coals, Liuzhi (LZ) and Zunyi (ZY), were pyrolyzed in a fixed bed reactor under N2 and H2 atmospheres from 400℃ to 700℃. X-ray Photoelectron Spectroscopy (XPS) was used to study the changes of carbon-containing groups and sulfur transformation on the surface of coals and their chars. Under N2 atmosphere, on the ZY chars surface, the contents of O=C-O, C-H or C-C groups have a decreasing trend and the one of C=O or O-C-O, C-O is increasing compared with that of raw coal at all temperatures. For LZ coal, the changes of O=C-O, C=O or O-C-O, C-O contents are similar to ZY coal, however the one of C-H and C-C content is contrary to that of ZY coal. Under H2 atmosphere, for ZY coal, not only O=C-O content, but also C=O and O-C-O, C-O contents have a decreasing trend, while C-H and C-C contents increase compared with raw coal; for LZ coal, except for C=O and O-C-O content has a decreasing trend, and other carbonyl groups have the same trend as that under N2 atmosphere. And for these coals, with the temperature increasing, the S/C ratio on the char surface increases under N2 atmosphere, however the one decreases at the temperatures from 400℃ to 600℃ and increases much at 700℃ under H2 atmosphere. This indicates that under both atmospheres, sulfur can transfer from inner to the surface during pyrolysis, but hydrogen can react with sulfur-containing radicals, so the S/C is lower than that under nitrogen.