Structural Changes in Manganese Oxides on Zeolite Y in Benzene Oxidation with Ozone and Post-Heat Treatment

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-11-25 DOI:10.1007/s10562-024-04836-2

Xuerui Zheng, Hisahiro Einaga

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Abstract

MnO_X supported on a zeolite Y catalyst (MnO_X/Y) is widely utilized for the removal of volatile organic compounds (VOCs), providing an understanding of catalyst structural changes and the factors influencing these changes. This study introduces a heat treatment method to recover the catalyst. The efficacy of the treated catalysts in enhancing the oxidation of benzene by ozone was improved. Investigation of the behavior of catalysts prepared from acetate and nitrate precursors revealed a common trend: MnO_X in the catalysts was readily reduced to MnO by intermediate products, acids, aldehydes, and phenols formed during the benzene ozonation process, as evidenced by X-ray absorption fine structure temperature-programmed reduction and in situ Fourier-transform infrared spectroscopy analyses. Heat treatment at 200 °C was found to be insufficient for the restoration of the MnO_X structure, which was attributed to the persistence of acids and hydrocarbons within the catalyst. 500 °C was determined to be more appropriate for the regeneration of the used catalysts, indicating the critical role of the heat treatment conditions in maintaining the effectiveness of the MnO_X/Y catalysts in VOC removal applications.

Graphical Abstract

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臭氧和后热处理苯氧化过程中沸石 Y 上氧化锰的结构变化

在沸石 Y 催化剂（MnOX/Y）上支撑的 MnOX 被广泛用于去除挥发性有机化合物 (VOC)，这为了解催化剂结构变化和影响这些变化的因素提供了机会。本研究介绍了一种回收催化剂的热处理方法。经过处理的催化剂在增强臭氧对苯的氧化作用方面的功效得到了改善。对醋酸盐和硝酸盐前驱体制备的催化剂的行为进行调查后发现了一个共同的趋势：催化剂中的 MnOX 很容易被苯臭氧氧化过程中形成的中间产物、酸、醛和酚还原成 MnO，X 射线吸收精细结构温度编程还原和原位傅立叶变换红外光谱分析都证明了这一点。在 200 °C 下进行热处理不足以恢复 MnOX 结构，原因是催化剂中存在酸和碳氢化合物。经测定，500 ° C 更适合于使用过的催化剂的再生，这表明热处理条件在保持 MnOX/Y 催化剂在去除挥发性有机化合物应用中的有效性方面起着至关重要的作用。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.