苯、甲苯和二甲苯（三苯）是现代化工生产急需的基础有机化工原料，利用可再生木质素资源通过催化热解技术开发非石油路线的三苯制备工艺具有重要意义。本项目针对木质素催化热解过程中原料的初始氧含量高、目标产物收率低和催化剂易积炭失活等问题，提出通过烘焙预处理技术脱除部分含氧官能团，降低O/C比；并利用过渡元素镓（Ga）对HZSM-5分子筛进行修饰改性，制备Ga/HZSM-5双功能催化剂，提高催化热解过程中酚类含氧中间产物的脱羟基、脱甲氧基、脱羰基反应速率，强化烯烃中间产物的芳构化反应强度，提升三苯目标产物收率；同时抑制中间产物缩聚形成多环芳烃焦炭前驱体，改善催化剂积炭行为。旨在系统地掌握木质素烘焙脱氧过程中理化特征和分子结构的演变规律，探究木质素择形催化转化反应路径和调控机理，阐明木质素烘焙脱氧—Ga修饰分子筛催化热解—制备高收率三苯及抑制积炭形成的关联耦合机制，为木质素的高值化利用提供新途径。

Catalytic fast pyrolysis of renewable lignin source is one of the most promising rotus for the production of basic organic chemical raw material (such as BTX, benzene, toluene and xylene) from non-petroleum resources. The critical problems during lignin catalytic fast prolysis process are the high oxygen content, the low yield of BTX target products, the coke formation and deactivation of catalyst. Facing these problems, the torrefaction pretreatment is firstly performed to reduce the ratio of O/C by falling off of the oxygenous functional groups, then the catalytic fast prolysis of torrefacted lignin is carried out using Ga/HZSM-5 catalyst in order to increase the yield of BTX and reduce the coke formation on the catalyst. The pathway of increasing the BTX yield is by increasing the rate of dehydroxylation, demethoxyl and decarbonyl group reaction from the intermediate products of oxygenous phenols, also increasing the strength of the aromatization reaction of olefins. The pathway of reducing the coking formation on the catalyst is by restraining the formation of coke precursor polyaromatic hydrocarbon from the intermediate products of oxygenous phenols. The aim of this project is to obtain the evolution rule of the physochemical characteristics and molecular structure, the BTX formation pathway from shaple selective catalytic fast pyrolysis from lignin, and the establishment of the synergistic effect of “torrefaction deoxygenation一Ga modified zeolite molecular sieve catalytic fast pyrolysis一 high BTX yield and restraining the coke formation”. This research would supply theoretical basis for high value-added utilization of lignin.