State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China; Quanzhou Institute for Environmental Protection Industry, Nanjing University, Beifeng Road, Quanzhou, 362000, China.
Chemosphere. 2021 May;271:129604. doi: 10.1016/j.chemosphere.2021.129604. Epub 2021 Jan 9.
Low-temperature catalytic degradation of VOCs with ozone has received widespread attention recently. In this work, a combination method of steam and nitric acid was used to control the dealuminization of Y zeolite, and then manganese oxide was loaded on the Y zeolite by impregnation method. It was found that MnO was highly dispersed in the dealumination zeolite, and the adsorbed oxygens were more easily activated in the active oxygen vacancies. The MnO supported on dealumination Y zeolite showed better catalytic effect than that supported on the parent Y. At low humidity (0.8%) in 30 °C, the degradation efficiency of toluene reached above 94% by using the catalyst with mild dealumination. When more water vapor was introduced, the degradation of toluene was inhibited. However, the catalytic performance of the catalyst with deep dealumination was not affected. With the help of in-situ DRIFTS, it was observed that the intermediates and reaction by-products had changed under different humidity conditions.
低温条件下臭氧催化降解 VOCs 受到广泛关注。本工作采用水蒸气和硝酸联合脱铝的方法对 Y 沸石进行控制脱铝，然后采用浸渍法将 MnO 负载在 Y 沸石上。结果表明，MnO 在脱铝沸石中高度分散，吸附氧在活性氧空位中更容易被激活。负载在脱铝 Y 沸石上的 MnO 比负载在母体 Y 沸石上的 MnO 具有更好的催化效果。在 30°C、低湿度（0.8%）条件下，采用轻度脱铝的催化剂，甲苯的降解效率达到 94%以上。当引入更多水蒸气时，甲苯的降解受到抑制。然而，深度脱铝的催化剂的催化性能不受影响。借助原位 DRIFTS，观察到在不同湿度条件下中间产物和反应副产物发生了变化。
