Regulating the MnOx structure in Ru/MnOx/γ-Al2O3 catalyst to enhance the oxidation of benzyl alcohol with molecular oxygen in liquid phase

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Applied Catalysis A: General Pub Date : 2025-03-13 DOI:10.1016/j.apcata.2025.120217

Jianhang Zhang, Qianqian Shi, Peizheng Zhao, Qinghu Tang

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Abstract

Ru/MnO_x/γ-Al₂O₃ catalysts prepared by a facile sequential precipitation- deposition method were investigated for the aerobic oxidation of benzyl alcohol with molecular oxygen. The physicochemical properties of the synthesized catalyst were characterized by multiple analytical and characterization techniques. It was found that the highly dispersed MnO(OH) could significantly improve the catalyst activity. When a Mn loading of ca. 10 wt% was used, the catalytic activity of supported Ru catalyst was the highest. The benzyl alcohol conversion and the selectivity of benzaldehyde after 1 h reaction at 80 °C were 100 % and 99 %, respectively. Excessive Mn, however, would lead to large amount of aggregated Mn₃O₄, resulting in a poor activity. The Mn in the sample roasted below 300 °C was highly dispersed MnO(OH), and the corresponding catalyst showed a high activity. High-temperature aggregated MnO(OH) to Mn₃O₄, leading to a decreased catalyst activity.

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调控Ru/MnOx/γ-Al2O3催化剂中MnOx结构，促进甲醇在液相中与分子氧氧化

研究了用顺序沉淀-沉积法制备Ru/MnOx/γ-Al2O3催化剂对苯甲醇的分子氧好氧氧化作用。采用多种分析表征技术对合成催化剂的理化性质进行了表征。结果表明，高度分散的MnO（OH）能显著提高催化剂的活性。当Mn负载量为10 wt%时，负载型Ru催化剂的催化活性最高。在80 ℃下反应1 h后，苯甲醇的转化率和苯甲醛的选择性分别为100 %和99 %。过多的Mn会导致大量的Mn3O4聚集，导致活性差。在300 °C以下焙烧的样品中Mn为高度分散的MnO(OH)，相应的催化剂表现出较高的活性。高温使MnO（OH）聚集成Mn3O4，导致催化剂活性降低。

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来源期刊

Applied Catalysis A: General 化学-环境科学

CiteScore

9.00

自引率

5.50%

发文量

415

审稿时长

24 days

期刊介绍： Applied Catalysis A: General publishes original papers on all aspects of catalysis of basic and practical interest to chemical scientists in both industrial and academic fields, with an emphasis onnew understanding of catalysts and catalytic reactions, new catalytic materials, new techniques, and new processes, especially those that have potential practical implications. Papers that report results of a thorough study or optimization of systems or processes that are well understood, widely studied, or minor variations of known ones are discouraged. Authors should include statements in a separate section "Justification for Publication" of how the manuscript fits the scope of the journal in the cover letter to the editors. Submissions without such justification will be rejected without review.