氢气在煤液化初始高活性阶段的作用机理

REACTION MECHANISM OF HYDROGEN FOR INITIAL HIGH REACTIVITY OF COAL LIQUEFACTION

采用GJ-2型共振搅拌反应釜,首先研究了一定条件下煤液化转化率随时间的变化关系.结果表明,煤液化反应过程中存在着初始高活性反应阶段,而且煤在该阶段完成了绝大部分液化反应;接着研究了氢气在煤液化初始高活性阶段的作用机理.结果如下:1)在无催化液化条件下,氢气在煤液化初始高活性阶段几乎不参与煤液化反应;2)煤液化初始高活性阶段氢气能够快速溶解于煤液化溶剂中,因此氢气的溶解过程不是其未有效参与煤液化反应的主要原因;3)在煤液化初始高活性阶段添加高分散性铁系催化剂和助剂硫,氢气在催化剂作用下参与了煤液化反应,进而使液化总转化率提高7%以上.

In this paper,the reaction between total conversion and time was investigated by liquefaction of Yanzhou coal using a 17 mL tubular resonance agitation microautoclave reactor under certain condition.It was found that coal liquefaction existed an initial stage of high reactivity.During this stage,most of the liquefaction reaction was completed.Then the reaction mechanism of hydrogen for the initial high reactivity stage was studied by coal liquefaction.The results show that： 1） without catalyst,in the initial high reactivity stage of coal liquefaction,hydrogen could not participate coal liquefaction reaction;2） in the initial high reactivity stage of coal liquefaction,hydrogen soluted in coal liquefaction solvent rapidly.Thus the main reason that hydrogen did not participate the liquefaction reaction effectively is not the solution process;3） adding high dispersion iron catalyst with sulfur promoter in the initial high reactivity stage of coal liquefaction,hydrogen,activated by the catalyst impregnation,was able to participate coal liquefaction reaction.By which the total conversion increased more than 7 percent.