文献类型：期刊文献

英文题名：Observation of the type of hydrogen bonds in coal by FTIR

作者：Chen, Chong[1]; Gao, Jinsheng[1]; Yan, Yongjie[1]

机构：[1]E China Univ Sci & Technol, Dept Chem Engn Energy Resource, Shanghai 200237, Peoples R China

年份：1998

卷号：12

期号：3

起止页码：446

外文期刊名：ENERGY & FUELS

收录：;EI(收录号：1998314246599);WOS:【SCI-EXPANDED(收录号:WOS:000073631900001)】；

语种：英文

外文关键词：Calcium compounds - Evaporation - Fourier transform infrared spectroscopy - Hydrogen bonds - Pyrolysis - Thermodynamic stability - Vacuum applications - Water

摘要：It is hard to distinguish the type of hydrogen bonds formed by hydroxyl groups by normal FTIR methods because of the interference of water in samples. In this work, a method is proposed for the clear observation of the types of hydrogen bonds by FTIR. The method involves the evaporation of water in a vacuum chamber with CaF2 windows (vacuum level, 4 x 10(-3) kPa) followed by in situ scanning of the IR spectrum. Five types of hydrogen bonds were found in coal and its extracts. The hydroxyl groups in coal mainly exist as self-associated OH and OH-N hydrogen-bonded pairs. The thermal stability of these hydrogen bonds was investigated by means of in-situ pyrolysis FTIR. It follows the order of OH-ether O > self-associated OH x cyclic OH > OH-N > OH-pi.