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.

李雪琴(1998—),女,四川雅安人,硕士研究生。E-mail:lixueqin135@163.com

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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.