Abstract The present study aims to improve the yields and selectivity of aromatic hydrocarbons in the catalytic pyrolysis of biomass by the addition of low-density polyethylene (LDPE), which has a higher hydrogen-carbon ratio than biomass. We have investigated the thermal decomposition behavior and kinetics, as well as the product distribution, of the co-pyrolysis of biomass (cellulose and pine sawdust) and plastic (LDPE) both with and without a catalyst (HZSM-5) using thermogravimetric analysis (TGA) and analytical pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). Our results, based on the weight loss difference (△W), show that there is a positive and synergistic interaction between the biomass and LDPE. After the addition of LDPE, the synergistic reactions inhibited catalyst coking effectively and decreased the formation of solid residues. In addition, the ZSM-5 catalyst improved the reaction activity and reduced the activation energy, although the reaction mechanism is not changed. At the same time, the Flynn-Wall-Ozawa (FWO) method was used to fit the kinetic data for both non-catalytic and catalytic co-pyrolysis of biomass and LDPE, and the activation energies (Ea) of the cellulose + LDPE + catalyst and pine + LDPE + catalyst systems were found to be 168.81 and 185.87 kJ/mol, respectively. The co-pyrolysis of biomass and LDPE effectively improved the yield and selectivity of aromatics and increased the selectivity for benzene, toluene, xylene, and ethylbenzene (BTXE). The addition of LDPE can effectively improve the selectivity for naphthalene family products (methylnaphthalene and 2-methylnaphthalene) in the catalytic pyrolysis of biomass and decrease the content of aromatic hydrocarbons larger than C10.

中文翻译：

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通过热重分析和热解-GC/MS 研究生物质和低密度聚乙烯共热解的热行为、动力学和产品表征

摘要 本研究旨在通过添加氢碳比高于生物质的低密度聚乙烯（LDPE）来提高生物质催化热解中芳烃的产率和选择性。我们使用热重分析研究了使用和不使用催化剂 (HZSM-5) 的生物质（纤维素和松木屑）和塑料 (LDPE) 共热解的热分解行为和动力学以及产物分布（ TGA) 和分析型热解-气相色谱/质谱 (Py-GC/MS)。我们的结果基于重量损失差异 (△W)，表明生物质和 LDPE 之间存在积极的协同相互作用。加入 LDPE 后，协同反应有效地抑制了催化剂结焦并减少了固体残留物的形成。此外，ZSM-5催化剂提高了反应活性并降低了活化能，但反应机理没有改变。同时，Flynn-Wall-Ozawa (FWO) 方法用于拟合生物质和 LDPE 的非催化和催化共热解的动力学数据，以及纤维素 + LDPE + 的活化能 (Ea)催化剂和松木 + LDPE + 催化剂体系分别为 168.81 和 185.87 kJ/mol。生物质与LDPE的共热解有效提高了芳烃的产率和选择性，提高了苯、甲苯、二甲苯和乙苯（BTXE）的选择性。