Enhanced aromatics production through Fe and HZSM-5 catalytic lignin pyrolysis with magnetic field assistance

IF 9.2 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Green Chemistry Pub Date : 2024-04-22 DOI:10.1039/d3gc04923j

Qing Yao , Baofeng Zhao , Haibin Guan , Di Zhu , Bari Wulan , Laizhi Sun , Angang Song , Qiaoling Liu , Anguo Zhang , Shuyuan Han , Xiang Ji

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Abstract

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.

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在磁场辅助下通过铁和 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以生产芳烃的研究已经非常广泛。但仍存在一些局限性，包括催化剂失活和高成本改性。本研究采用磁场（MF）辅助铁和 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）的含量与磁场强度呈上升趋势。中频的引入对 BTEX 产量的提高有很大影响。在催化裂化强度为 80 mT、温度为 500 °C 和载气流速为 50 mL min-1 的条件下，MAH 和 BTEX 含量分别达到 32.94% 和 27.19%，而 BTEX 收率大约为 19.55 mg g-1。与无 MF 相比，这些数值分别提高了约 1.28 倍、1.36 倍和 1.94 倍。XRD、XPS、TPO、N2 吸附-解吸和 NH3-TPD 试验的表征结果表明，MF 促进了铁表面大分子含氧化合物的脱氧和破碎，促进了小分子化合物进入 HZSM-5 的孔隙，并提高了 MAH 的产量。同时，MF 阻碍了 HZSM-5 中孔隙的堵塞，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基础。

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来源期刊

Green Chemistry 化学-化学综合

CiteScore

16.10

自引率

7.10%

发文量

677

审稿时长

1.4 months

期刊介绍： Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.