REGULATION OF HYDROGEN BONDS IN COAL THROUGH O-METHYLATION AND ITS EFFECT ON PYROLYSIS PROPERTY
O－烷基化对煤中氢键的调控及对热解特性的影响

The variation and thermal stability of hydrogen bonds (HBS) in Huolinhe lignite before and after O-methylation treatment were studied by in-situ diffuse reflectance FTIR(DRIFT). The pyrolysis behavior of the raw and treated coal was investigated by TG. A new calibration method using the band of kaolinite and illite near 3?690?cm~(-1) as the basis was suggested to compare the spectrum of the raw and treated coal. The results show that the amount of HBS greatly decreased after O-methylation, but it could not be eliminated completely. The decrease extent of HBS depends on the kinds of HBS. The weaker the HBS are the less the regulation extent will be. The thermal stability of HBS in coal after O-methylation increased at high temperature. During pyrolysis the O-methylated coal has greater conversion, lower initial decomposition temperature, wider pyrolysis temperature range and higher weight loss rate than the raw coal.