Catalytic Complete Oxidation of Ethyl Acetate on MnOx/MgAl2O4 Catalysts

IF 1.3 4区化学 Q4 CHEMISTRY, PHYSICAL

Kinetics and Catalysis Pub Date : 2024-07-31 DOI:10.1134/S0023158423601134

Dong Peng, Qing Wang, Shaohong Zang, Liuye Mo

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Abstract

Volatile organic compounds (VOCs), play a crucial role as precursors of ozone (O₃) and secondary organic aerosols, making them significant air pollutants. Efforts to effectively eliminate ethyl acetate (EA), a typical VOC in many industrial processes, has attracted significant attention worldwide. In this study, a catalyst consisting of MgAl₂O₄ spinel prepared via the sol-gel method was adopted to support MnO_x by incipient wetness impregnation for complete catalytic oxidation of EA. The prepared catalysts were characterized by XRD, SEM, TEM, BET, XPS and H₂-TPR. It was found that the calcination temperature of the support is crucial for the catalytic activity. The optimal calcination temperature of the support is found to be 800°C, resulting in a perfect MgAl₂O₄ spinel phase and a crystalline size of 8.3 nm. The optimized MnO_x/MA-800 displayed high catalytic activity (T₉₅ = 240°C) and stability due to its high reduction ability and high atomic ratios of Mn⁴⁺/Mn³⁺ and O_ads/O.

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MnOx/MgAl2O4 催化剂上的乙酸乙酯催化完全氧化反应

摘要挥发性有机化合物（VOCs）作为臭氧（O3）和二次有机气溶胶的前体物质发挥着至关重要的作用，使其成为重要的空气污染物。醋酸乙酯（EA）是许多工业生产过程中的典型挥发性有机化合物，为有效消除醋酸乙酯而做出的努力引起了全世界的广泛关注。本研究采用溶胶-凝胶法制备了一种由 MgAl2O4 尖晶石组成的催化剂，通过初湿浸渍法支撑 MnOx，以实现对 EA 的完全催化氧化。对制备的催化剂进行了 XRD、SEM、TEM、BET、XPS 和 H2-TPR 表征。研究发现，载体的煅烧温度对催化活性至关重要。研究发现，支撑物的最佳煅烧温度为 800°C，可形成完美的 MgAl2O4 尖晶石相，结晶尺寸为 8.3 nm。优化后的 MnOx/MA-800 具有很高的催化活性（T95 = 240°C）和稳定性，这得益于它的高还原能力以及 Mn4+/Mn3+ 和 Oads/O 的高原子比。

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

Kinetics and Catalysis 化学-物理化学

CiteScore

2.10

自引率

27.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Kinetics and Catalysis Russian is a periodical that publishes theoretical and experimental works on homogeneous and heterogeneous kinetics and catalysis. Other topics include the mechanism and kinetics of noncatalytic processes in gaseous, liquid, and solid phases, quantum chemical calculations in kinetics and catalysis, methods of studying catalytic processes and catalysts, the chemistry of catalysts and adsorbent surfaces, the structure and physicochemical properties of catalysts, preparation and poisoning of catalysts, macrokinetics, and computer simulations in catalysis. The journal also publishes review articles on contemporary problems in kinetics and catalysis. The journal welcomes manuscripts from all countries in the English or Russian language.