Study On Catalysts For Nitric Oxide Purification At Room Temperature

In this thesis, copper-manganese oxide catalysts and metal oxide supported activated carbon catalysts were studied. Without the introduction of reducing agent, the purpose of purification of air pollutants was achieved. Catalytic properties of these catalysts for NO elimination at room temperature were mainly investigated.A series of copper manganese oxide catalysts were prepared using re-precipitation procedure, in particular, the effect of arrange of preparation variables were investigated in detail. The variables investigated include [Cu]/ [Mn] ratio, calcination temperatures and calcination times. The optimum prepatation conditions were identified with respect to the catalyst activity for NO elimination at room temperature. The results showed that copper manganese oxide catalysts exhibited high catalytic activity, long-term stability, and good regeneration. The catalysts calcined at different temperatures were characterized by XRD and XPS techniques. The microstructure and phase were obtained and related to the catalytic activity reasonably. The reaction mechanism was investigated by in-situ FTIR. The different catalytic performances of commercial hopcalite, manganese dioxide, copper carbonate and copper manganese oxide for NO elimination were studied. However, copper manganese oxides were found to be in the formation of complicated complex but not a mix. A series of metal oxide supported actived carbon catalysts were prepared by impregnation procedure, and the catalytic activity on NO emilination was studied. In addition, catalytic performances of copper manganese oxide modied with doped metal oxides and pretreatment by plasma were studied. Although no better catalytic activity was found, some valuable experiences were obtained.In summarize, without the introduction of reducing agent, copper manganese oxides and metal oxide supported activated carbon catalysts exhibited high catalytic activity for NO elimination at room temperature, which can be applied to air purification in the future.