低阶煤中氧的测定方法及对煤直接液化的影响

氧是煤中最丰富的杂原子,其含量和存在形式对煤的性质有很大影响,特别是对低阶煤的影响更为显著。低阶煤中的氧主要以酚羟基和醚键形式存在,此外还有羰基、羧基和呋喃等。介绍了低阶煤中含氧官能团的测定方法,结果发现:物理方法方便快捷,但XPS、IR等分析手段因一些峰值无法识别,降低了实用性;化学方法步骤繁琐,操作时间长且准确性较差。综述了含氧官能团对煤直接液化的影响,酚羟基在液化过程中因发生交联反应而产生负面影响;高级醚类具有高的液化特性;羧基的液化机理复杂,没有统一的意见。 Oxygen content is more than any other elements in coal,whose content and existing forms have a great effect on the characteristics of coal,especially on that of low rank coal.The oxygen in low rank coal is mainly represented by phenolic hydroxy1 and ether bond,also carbony1,carboxy1,furan and the like.Sum up and compare two kinds of determination methods of oxygen functional groups.The results show that physical determination method is convenient and efficient,however,its practical applicability is poor,for X-ray photoelectron spectroscopy(XPS)and infrared radiation(IR) fail to distinguish some peaks.The operation of chemical determination method is complex and time-consuming along with inaccurate results.Analyze the influence of those oxygen functional groups on coal direct liquefaction.It's found that phenolic hydroxy1 interferes the liquefaction for its cross-linking reaction,liquefying ability of high ether is much more active,liquefying mechanism of carboxy1 is complicated.The study of oxygen functional groups helps to improve coal liquefaction level,also enriches coal science and technology theory