煤催化多段加氢热解过程的产物分析

Product Analysis of Catalytic Multi Stage Hydropyrolysis of Coal

以 Mo S2 为催化剂在固定床反应器中对寻甸褐煤的加氢热解及多段加氢热解过程的产品分布、性质进行了详细的分析 .结果表明 :多段催化加氢热解与传统的加氢热解相比 ,转化率及焦油收率均有所提高 ,尤其是油收率从 5 1 .8%提高到 63.9% ,同时气体收率减少一半 ;催化条件下煤多段加氢热解焦油与传统加氢热解焦油在组成上并没有特别显著的不同 ,但是各组分间的相对含量却有较大的差别 .煤的多段加氢热解过程明显提高了焦油中轻质组分的含量 ,使焦油进一步轻质化 .其中苯类、酚类和萘类分别增加了 42 % ,37.8%和 1 1 5 .4% ;由多段催化加氢热解所得的半焦的比表面积要比由传统催化加氢热解所得的大得多 ,而且平均孔径也明显减小 ,半焦的孔体积增加了一倍以上 ;

Multi-stage hydropyrolysis (MHyPy) and hydropyrolysis (HyPy) of Xundian lignite, with MoS2 as the catalyst, were performed in a fixed bed reactor. The product distribution and property were investigated in detail. The results show that the tar yield increases to 63.9% during MHyPy compared with that of 51.8% in HyPy, while the gas yield decreases by a half. The tar composition does not make big difference between MHyPy and HyPy. However, the light aromatics in the tar from MHyPy increase remarkably by 42%, 37.8% and 115.4% for BTX, PCX and naphthalenes respectively. The specific surface area of char from MHyPy is larger than that from HyPy. The average pore diameter of char from MHyPy is smaller than that from HyPy, while the pore volume increases by 100% compared with that from HyPy. The catalytic MHyPy has an obvious advantage over HyPy.