Catalytic pyrolysis of lignocellulosic biomass usually suffers from coking because of its hydrogen-deficient and oxygen-rich nature. The co-feeding of biomass with plastics may enhance product quality. Herein, we studied the catalytic co-pyrolysis of low-density polyethylene (LDPE) and lignin (LG) over HZSM-5 modified with Cu. The effects of Cu valence and feedstock mass ratio on the product distributions were characterized by online photoionization mass spectrometry. Our results show that the addition of Cu limits the formation of aliphatics and promotes the aromatization reaction to produce monocyclic aromatic hydrocarbons (MAHs). The Cu₂O/HZSM-5 catalyst exhibits better dehydrogenation activity and promotes the formation of phenolics, while the CuO/HZSM-5 catalyst has a better selectivity for MAHs. In addition, the feedstock mass ratio was also screened, indicating that the highest yield of aromatics was obtained at a mass ratio of 1:3 (LG: LDPE). This work provides new insights into the efficient use of biomass and plastics.

由于其缺氢富氧的性质，木质纤维素生物质的催化热解通常会发生焦化。生物质与塑料的共同饲喂可以提高产品质量。在此，我们研究了Cu 改性 HZSM-5 上低密度聚乙烯 (LDPE) 和木质素 (LG) 的催化共热解。通过在线光电离质谱表征了Cu价和原料质量比对产物分布的影响。我们的结果表明，Cu的添加限制了脂肪族化合物的形成并促进芳构化反应产生单环芳烃（MAH）。铜₂O/HZSM-5催化剂表现出更好的脱氢活性并促进酚类物质的形成，而CuO/HZSM-5催化剂对MAHs具有更好的选择性。此外，还对原料质量比进行了筛选，表明质量比为1:3（LG:LDPE）时芳烃收率最高。这项工作为有效利用生物质和塑料提供了新的见解。