Catalytic hydrocracking of pyrolytic lignin over bimetallic Ru-M/HZSM-5 (M = Ni, Fe or Co) for aromatic hydrocarbon production

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-09-15 DOI:10.1016/j.jaap.2025.107387

Qinjie Cai , Zewei Hu , Zhijia Dong , Suping Zhang

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引用次数: 0

Abstract

Pyrolytic lignin (PL) can be converted into aromatic hydrocarbons through catalytic hydrocracking. This study investigated the performance of bimetallic Ru-M/HZSM-5 catalysts (M = Ni, Fe, or Co) in the hydrocracking of PL, focusing on the impact of introducing a second metal on the efficiencies of hydrodepolymerization (HDP) and hydrodeoxygenation (HDO). The 2Ru-5Ni/HZSM-5 catalyst exhibited the best performance in HDP and HDO. The introduction of Ni enabled the formation of RuNi alloy and additional metallic Ni sites for H₂ activation to enhance HDP. Furthermore, the RuNi alloy was proposed to promote the HDO of monophenols via a short-path hydrogen spillover between Ru and Ni, which was more efficient than HDO mediated by co-working of Ru and acid sites on unmodified Ru/HZSM-5. While RuFe and RuCo alloys could also strengthen HDO of monophenols through the aforementioned mechanism, the reduction of strong Brønsted acid sites by the incorporation of Fe or Co adversely impacted HDP. Under the optimum reaction conditions, the oil phase yield from hydrocracking over 2Ru-5Ni/HZSM-5 reached 51.42 %, with GC-detectable products accounting for approximately 78 %. Particularly, the yields of mono-ring and double-ring aromatic hydrocarbons were 21.08 % and 8.66 %, respectively. In addition, this catalyst demonstrated excellent reusability.

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双金属Ru-M/HZSM-5 （M = Ni， Fe或Co）催化木质素加氢裂化生产芳烃

热解木质素（PL）可以通过催化加氢裂化转化为芳烃。本研究研究了双金属Ru-M/HZSM-5催化剂（M = Ni， Fe或Co）在PL加氢裂化中的性能，重点研究了引入第二金属对加氢解聚（HDP）和加氢脱氧（HDO）效率的影响。2Ru-5Ni/HZSM-5催化剂在HDP和HDO中表现出最好的性能。Ni的引入使RuNi合金的形成和额外的金属Ni位点的H2活化，以提高HDP。此外，RuNi合金通过Ru和Ni之间的短程氢溢出来促进单酚类化合物的HDO，这比未经改性的Ru/HZSM-5上Ru和酸位共同作用介导的HDO更有效。虽然RuFe和RuCo合金也可以通过上述机制增强单酚类化合物的HDO，但Fe或Co的掺入对强Brønsted酸位的还原会对HDP产生不利影响。在最佳反应条件下，2Ru-5Ni/HZSM-5加氢裂化油相收率达到51.42 %，气相色谱检测产物约占78 %。其中单环芳烃和双环芳烃的产率分别为21.08 %和8.66 %。此外，该催化剂还具有良好的可重复使用性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.