摘要
采用漫反射红外光谱 ( DRIFT)法 ,以 1 4 0℃时褐煤的单光束图为背景研究了两种褐煤中的水分 .结果表明 ,褐煤中水分的含量与光谱图相应区域的积分面积呈线性关系 ;在计算煤中水分形成的氢键键能的基础上 ,讨论了水分与煤表面间的氢键相互作用 ;根据 DRIFT谱 ,将煤中的水分分为游离态的水与以弱氢键与煤表面结合的水和与煤形成强氢键的水 .低于 80℃时主要脱除前者 ,而高于 80℃则主要脱除后者 .
With a new method of diffuse reflectance FTIR(DRIFT)(using the single channel spectrum of dry coal at 140 ℃ as the background), the water in two lignites was studied for the first time. The results show that the content of water is directly proportional to the integral area of the corresponding wave number range in the spectra of the water remained. Based on the calculated hydrogen bonding energy of the water in dry coal, the water-coal interaction(hydrogen bonding) was discussed. Moreover, according to the research result of DRIFT, the water in coal was classified into two forms: one is the free water or the water which is weakly hydrogen-bonded with coal and mainly removed below 80 ℃; and the other is the water tightly bound with coal surface through strong hydrogen bonding, which is removed above 80 ℃.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第12期2325-2328,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学青年基金 (批准号 :2 990 6 0 12 )资助
关键词
氢键
水分
原位漫反射红外光谱
褐煤
分析
Hydrogen bonding
Water
In situ diffuse reflectance FTIR
Lignite
