生物质三组分与低密度聚乙烯共催化热解制取轻质芳烃的协同作用机理

生物质与废塑料共催化快速热解是制取轻质芳烃的重要途径。 采用不同种类的分子筛催化剂，首先研究了分子筛种类对杨木、生物质三组分和低密度聚乙烯（LDPE）单独催化快速热解轻质芳烃产率的影响，其次研究了生物质三组分与LDPE在共催化热解过程中的协同作用机理。结果表明：在杨木、生物质三组分和LDPE单独催化快速热解时，HZSM-5（25）催化剂体现出最高的轻质芳烃产率；在杨木和LDPE共催化快速热解时，随着LDPE质量的增加，轻质芳烃的产率呈先升高后降低趋势；在生物质三组分和LDPE共催化快速热解时，纤维素和半纤维素热解的呋喃类中间产物与LDPE热解的轻烯烃中间产物易发生“双烯合成”反应，表现出较强的协同催化作用，促进轻质芳烃的生成，而木质素则抑制轻质芳烃生成。

Synergistic interactions of biomass three-component and low-density polyethylene during co-catalytic fast pyrolysis for the production of light aromatics

Co-catalytic fast pyrolysis (Co-CFP) of biomass and waste plastics is an important way to produce light aromatics. In this work, co-catalytic fast pyrolysis of three major component in biomass (cellulose, hemicellulose, and lignin) and low density polyethylene (LDPE) was carried out in Py-GC/MS by using different zeolite catalysts (HZSM-5 (25), HZSM-5 (85), HY, USY and MCM-41). The effect of catalytic pyrolysis parameters on the yield of light aromatics and the synergistic interactions between biomass three major components and LDPE were investigated. The results showed that, among the five types of zeolite catalysts, HZSM-5 (25) presented highest yield of light aromatics during single CFP of poplar, biomass three major components, and LDPE. During Co-CFP of poplar and LDPE, the yield of light aromatics increased first, and then decreased with the increase of mass of LDPE. During Co-CFP of biomass three major components and LDPE, Diels-Alder reaction occurred between the pyrolysis intermediates of the furans from cellulose/hemicellulose and the light olefins from LDPE, promoting the formation of light aromatics. However, the Co-CFP of lignin and LDPE hindered the formation of light aromatics.