介质阻挡放电联合锰基催化剂对乙酸乙酯的降解效果

采用等体积浸渍法制备锰基催化剂MnO_x/13X和MnO_x/γ-Al₂O₃，并在吸附-间歇放电模式下研究了其联合介质阻挡放电(DBD)等离子体对乙酸乙酯的氧化性能；对催化剂进行BET、SEM和XPS表征，以分析不同载体的Mn基催化剂氧化效果存在差异的原因。DBD氧化实验结果表明：与13X和γ-Al₂O₃相比，负载活性组分MnO_x后，CO_x产率分别提高了36.3%(MnO_x/13X)和29%(MnO_x/γ-Al₂O₃)，CO₂选择性均提高至98%以上，副产物臭氧明显减少。表征结果显示，MnO_x/13X上的Mn⁴⁺和晶格氧含量更高，更有利于乙酸乙酯的降解。结合吸附态乙酸乙酯的等离子体降解机理和不同填充材料的实验数据，建立了相应的动力学模型，为DBD降解挥发性有机物系统中催化剂的优化及其应用提供参考。

Degradation of ethyl acetate by dielectric barrier discharge combined with manganese-based catalyst

In this study, the manganese-based catalysts of MnOx/13X and MnOx/γ-Al2O3 were prepared by an equal volume wet impregnation method, and the oxidation performance on ethyl acetate degradation by these manganese-based catalysts combined with dielectric barrier discharge (DBD) plasma was evaluated under the adsorption-intermittent discharge mode. The BET, SEM and XPS characterization was performed to analyze the reasons for the different oxidation performance between MnOx/13X and MnOx/γ-Al2O3. The result of the DBD oxidation experiment showed that compared with 13X and γ-Al2O3, loading the active component of MnOx could lead to the increase of COx yield rate by 36.3% (MnOx/13X) and 29% (MnOx/γ-Al2O3), respectively, the increase of CO2 selectivity up to over 98%, and significant decrease of the by-product of ozone. The result of characterization demonstrated that the contents of Mn4+ and lattice oxygen on MnOx/13X were higher than those of MnOx/γ-Al2O3, which were beneficial to the degradation of ethyl acetate. Finally, the kinetics model was established based on the plasma degradation mechanism of adsorbed ethyl acetate and the experimental results of different packing materials. This study paves the way for the optimization and application of catalysts in the system of DBD degradation of VOCs.