Enhanced Catalytic Performance of FeMnOx Catalysts Synthesized via Agar Method for Toluene Oxidation: Synergistic Effects and Degradation Mechanism

IF 3.7 2区化学 Q2 CHEMISTRY, APPLIED

Applied Organometallic Chemistry Pub Date : 2025-05-04 DOI:10.1002/aoc.70183

Hongpan Liu, Huixin Yu, Dandan Fu, Zhongxian Song, Wei Wu, Dazhi Li, Haiyang Li, Yang He, Jinhui Zhang, Xuejun Zhang

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Abstract

Herein, FeMnO_x composite catalysts were synthesized using the agar method, aiming to enhance the catalytic performance for toluene oxidation. Compared to traditional preparation methods, the agar-gel technique leveraged the unique templating effect of biopolymer gels, which promoted the uniform dispersion and crystallization of the Fe-O-Mn structure, leading to the formation of abundant oxygen vacancies and surface defect sites. Results indicated that the catalytic performance of FeMnO_x (T₉₀ = 225°C) was significantly superior to that of single-metal oxides, attributed to the enhanced Mn³⁺ content, O_ads, and oxygen mobility induced by the Fe-Mn synergistic effect. Systematic characterization confirmed that the strong interaction between Fe and Mn in FeMnO_x reduced the Mn-O bond strength and optimized the adsorption and activation capabilities of oxygen species. In situ DRIFTS analysis further revealed the unique reaction pathway of FeMnO_x: benzoic acid could be directly converted to maleic anhydride, circumventing the formation of phenol intermediates, thereby reducing the accumulation of by-products and accelerating the deep oxidation of toluene to CO₂ and H₂O. This research presented a novel strategy for the green synthesis of efficient Fe-Mn catalysts and provided an innovative approach to the catalytic degradation of toluene.

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琼脂法合成FeMnOx催化剂对甲苯氧化性能的增强：协同效应及降解机理

本文采用琼脂法合成了FeMnOx复合催化剂，旨在提高其对甲苯氧化的催化性能。与传统制备方法相比，琼脂凝胶技术利用生物聚合物凝胶独特的模板效应，促进了Fe-O-Mn结构的均匀分散和结晶，从而形成了丰富的氧空位和表面缺陷位点。结果表明，FeMnOx （T90 = 225°C）的催化性能明显优于单一金属氧化物，这是由于Fe-Mn协同效应导致的Mn3+含量、负载和氧迁移率的提高。系统表征证实，FeMnOx中Fe和Mn之间的强相互作用降低了Mn- o键强度，优化了氧的吸附和活化能力。原位DRIFTS分析进一步揭示了FeMnOx独特的反应途径：苯甲酸可以直接转化为马来酸酐，绕过了苯酚中间体的形成，从而减少了副产物的积累，加速了甲苯深度氧化为CO2和H2O。本研究为高效Fe-Mn催化剂的绿色合成提供了新策略，为甲苯的催化降解提供了创新途径。

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

Applied Organometallic Chemistry 化学-无机化学与核化学

CiteScore

7.80

自引率

10.30%

发文量

408

审稿时长

2.2 months

期刊介绍： All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.