The use of HZSM-5 and modified catalysts for the pyrolysis of lignin to produce aromatics has been extensively investigated. But certain limitations including catalyst deactivation and high-cost modifications still exist. A magnetic field (MF) was used to assist Fe and HZSM-5 catalytic lignin pyrolysis for aromatics production in this study. Product composition analysis revealed that the monocyclic aromatic hydrocarbon (MAH) and benzene, toluene, ethylbenzene, and xylene (BTEX) contents exhibited an upward trend in correlation with the MF intensity. The introduction of a MF significantly affects the improvement of the BTEX yield. Under the conditions of 80 mT MF intensity, 500 °C temperature and 50 mL min⁻¹ carrier gas flow rate, the MAH and BTEX contents reach 32.94% and 27.19%, while the BTEX yield reaches roughly 19.55 mg g⁻¹. Compared to no MF, these values rose by about 1.28, 1.36, and 1.94 times, respectively. Characterization results from XRD, XPS, TPO, N₂ adsorption–desorption, and NH₃–TPD tests showed that the MF facilitated the deoxidation and fragmentation of macromolecular oxygenates on the surface of Fe, promoting the ingress of smaller molecular compounds into the pores of HZSM-5 and boosting MAH production. Simultaneously, the MF impeded pore blockage in HZSM-5 and kept acidic sites from deactivating due to carbon deposition. This study lays a crucial groundwork for improving advanced technologies aimed at optimizing the utilization of organic solid waste.

中文翻译：

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在磁场辅助下通过 Fe 和 HZSM-5 催化木质素热解提高芳烃产量

使用 HZSM-5 和改性催化剂热解木质素生产芳烃已得到广泛研究。但某些限制仍然存在，包括催化剂失活和高成本改造。本研究中使用磁场 (MF) 辅助 Fe 和 HZSM-5 催化木质素热解生产芳烃。产品成分分析表明，单环芳烃（MAH）和苯、甲苯、乙苯和二甲苯（BTEX）含量随MF强度呈上升趋势。MF的引入显着影响了BTEX产量的提高。在80 mT MF强度、500 ℃温度和50 mL min ^-1载气流量的条件下，MAH和BTEX含量分别达到32.94%和27.19%，而BTEX产量大约达到19.55 mg g ^-1。与没有 MF 相比，这些值分别上升了约 1.28、1.36 和 1.94 倍。XRD、XPS、TPO、N ₂吸附-脱附和NH ₃ -TPD测试的表征结果表明，MF促进了Fe表面大分子含氧化合物的脱氧和裂解，促进了小分子化合物进入Fe的孔隙中。 HZSM-5 和提高 MAH 产量。同时，MF 阻止了 HZSM-5 中的孔隙堵塞，并防止酸性位点因碳沉积而失活。这项研究为改进旨在优化有机固体废物利用的先进技术奠定了重要的基础。