• 关键词：低温等离子体  双金属锰基催化剂  氯苯  降解特性  副产物

• 基金项目：浙江省科技计划项目-公益技术（No.LGF20B070002）

• 姜理英
• 浙江工业大学环境学院, 杭州 310032

• 张瑜芬
• 浙江工业大学环境学院, 杭州 310032

• 胡俊
• 浙江工业大学环境学院, 杭州 310032

• 姚志伟
• 浙江工业大学环境学院, 杭州 310032

• 黄武
• 浙江工业大学环境学院, 杭州 310032

• 汤露
• 浙江工业大学环境学院, 杭州 310032

• 摘要：以TiO₂为载体，采用共沉淀法制备了3种双金属催化剂（Co-Mn/TiO₂、Ce-Mn/TiO₂和Nb-Mn/TiO₂），与低温等离子体（NTP）协同对氯苯进行降解，并通过XRD、SEM、TEM、BET、XPS、H₂-TPR和O₂-TPD手段表征其物化性质，以阐明不同催化剂对氯苯的等离子体催化降解差异.结果显示，与单独的NTP相比，双金属催化剂耦合NTP可显著提高氯苯的降解效率和矿化率，减少有毒副产物的产生.Co-Mn/TiO₂的催化活性优于Ce-Mn/TiO₂和Nb-Mn/TiO₂，在氯苯初始浓度为300 mg·m^-3，气体停留时间为2 s，放电电压为15 kV的工况条件下，Co-Mn/TiO₂耦合的NTP系统对氯苯的降解效率和CO₂选择性分别达78.14%和51.02%，其O₃的排放浓度为211 mg·m^-3.表征结果也验证了以上结论，3种催化剂的金属氧化物均在TiO₂表面高度分散，催化剂的比表面积为51~64 m²·g^-1.Co-Mn/TiO₂催化剂表面的高Mn⁴⁺/Mn³⁺比和O_ads含量呈现出更多的氧空位，增大了氧迁徙率，因而表现出最高的催化活性和催化氧化性能.研究表明，双金属锰基催化剂耦合NTP降解氯苯具有很好的应用前景.

• Abstract：Bimetallic manganese-based catalysts (Co-Mn/TiO₂, Ce-Mn/TiO₂ and Nb-Mn/TiO₂) were supported on TiO₂ by co-precipitation method and combined with non-thermal plasma (NTP) catalytic degradation of chlorobenzene (CB). The physicochemical properties of the catalysts were characterized by XRD、SEM、TEM、BET、XPS、H₂-TPR and O₂-TPD to clarify the differences between the various catalysts during the plasma catalytic degradation of CB. The experimental results showed that the bimetallic catalysts combined with NTP significantly improved the CB removal efficiency and mineralization rate compared with the NTP alone. Meanwhile, it greatly reduced the production of poisonous by-products (O₃ and NO_x). Co-Mn/TiO₂ exhibited better catalytic activity than Ce-Mn/TiO₂ and Nb-Mn/TiO₂ in the NTP-catalysis reactor. At the initial concentration of 300 mg·m^-3, residence time of 2 s and discharge voltage of 15 kV, the degradation efficiency and CO₂ selectivity were 78.14% and 51.02% respectively in the Co-Mn/TiO₂ coupled NTP reactor, and the emissions of O₃ reached the minimum of 211 mg·m^-3. The characterization results also verified that the metal oxides were highly dispersed on the surface of TiO₂ for the catalysts, and the specific surface area was 51~64 m²·g^-1. The high Mn⁴⁺/Mn³⁺ ratio and O_ads content on the surface of the Co-Mn/TiO₂ catalyst presented more O-vacancies and increased the oxygen migration rate, exhibiting the highest catalytic activity and redox property. Therefore, bimetallic manganese-based catalyst combined with NTP has a good application prospect for the degradation of CB.

• Key words：non-thermal plasma  bimetallic manganese-based catalyst  chlorobenzene  degradation characteristics  by-product

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