State Key Laboratory of Clean and Efficient Coal Utilization,Taiyuan University of Technology
College of ChemicalEngineering & Technology,Taiyuan University of Technology

为了实现煤炭的洁净高效利用,提高煤热解过程中焦油中轻质芳烃的产率,采用高温水蒸气对Y型分子筛进行孔道结构调控,并探究其对不同煤阶煤样焦油中轻质芳烃产率及其分布的影响。通过采用高温水热处理方法对Y型分子筛进行脱铝处理,形成微−介孔结构。试验中,通过改变水热处理温度,研究其对分子筛孔结构的影响,并将其应用于煤热解挥发分的催化提质过程中。试验选取了3种不同煤阶的煤样,分别在600℃处理后的Y型分子筛催化下进行热解。结果表明:随着水热处理温度的升高,Y型分子筛的介孔数量和比表面积逐渐增大,但对分子筛结构的破坏也更加严重。600℃被认为是Y型分子筛水热脱铝的最佳处理温度。与直接热解相比,3种煤样经600℃处理后的Y型分子筛催化提质后,苯、甲苯、二甲苯、萘等轻质芳烃的总产率分别增加了4.2倍、5.2倍和2.3倍。微−介孔Y型分子筛显著降低了对焦油重质大分子物质的传质限制,提高了分子筛酸性位的可利用性,从而显著提高了催化剂对焦油的改质效果。为煤热解焦油的资源化利用提供了新的技术途径,对煤炭的高附加值利用具有重要意义。通过优化催化剂的孔结构和酸性位,可以有效提高煤热解产物的品质和产率,为煤化工产业的发展提供技术支持。

As a new clean coal conversion process,coal pyrolysis is an effective means to achieve clean and efficient utilization of coal,andis of great strategic significance to the high-quality development of country. Catalytic upgrading of coal pyrolysis volatiles can be aneffective way to change the heavier components of tar to higher value-added substances. High value-added Light aromatics such asbenzene,toluene,xylene,naphthalene (BTEXN),which is one of the important ways to realize tar resource utilization. The porestructure of Y-type zeolite was regulated by high-temperature water vapor to explore its effect on the yield and distribution of lightaromatic hydrocarbons in coal tar of different coal rank. The results show that high temperature hydrothermal treatment can remove theframework aluminum of Y-type zeolite and form micro-mesoporous structure. With the increase of hydrothermal treatment temperature,the number of mesoporous and the mesoporous specific surface area as well as pore volume also increase,but the damage to the structureof zeolite is more serious. 600 ℃ is the best treatment temperature for hydrothermal dealumination of Y-type zeolite. Compared withdirect pyrolysis,the total yield of BTEXN increased by 4.2,5.2 and 2.3 times respectively after catalytic upgrading of three kinds of coal by600HTY zeolite. Micro-mesoporous Y-type zeolite greatly reduces the mass transfer restriction on heavy macromolecular substances oftar,improves the availability of acid sites of zeolite,and significantly improves the upgrading effect of catalyst on tar.

国家自然科学基金资助项目(22078224);山西省基础研究计划面上资助项目(20210302123193)

李雪琴,闫伦靖,刘玉洁,等.微−介孔Y型分子筛对煤热解气态焦油催化改质的影响[J].洁净煤技术,2025,31(1):42−50.

LI Xueqin,YAN Lunjing,LIU Yujie,et al. Effect of micro-mesoporous Y-type zeolite on catalytic upgrading of gaseous tarduring coal pyrolysis[J].Clean Coal Technology,2025,31(1):42−50.