Study On Copper-Manganese Oxides For Air Purification

In this thesis, copper-manganese oxides catalysts were studied. The catalytic performance for the oxidation of carbon monoxide and formaldehyde at ambient temperature over copper-manganese oxides were investigated, furthermore.The copper manganese oxides were prepared using a co-precipitation procedure, in particular, the effect of a range of preparation variables were investigated in detail. The variables investigated include the precipitant dripping order [Cu]/[Mn] ratio, temperature of precipitation,pH, ageing time,calcination gas,calcination temperature, calcination time and calcination gas velocity. The optimum prepatation conditions were identified with respect to the catalyst activity for the oxidation of carbon monoxide at ambient temperature. The results shown that, copper-manganese oxides had better activity and stability. A series of copper-manganese oxides catalysts calcined at different temperature were characterized by XRD SEM and TPR techniques. The microstructure and phase were obtained and related to the catalytic activity reasonably. Compared with copper-manganese oxides and Au/Al₂O₃ commercial Pd/C,Waker,Hopcalite and catalytic performance of different catalysts for oxidation of carbon monoxide were investigated. Effect of different metal added to the copper-manganese oxides on the carbon monoxide oxidation was investigated, the results shown that the addition of noble metal Au Pt Pd had no significant effect on activity, the activity and stability were promoted by addition of Ag. Furthermore, the kinetics of carbon monoxide oxidation over copper-manganese oxides catalysts was investigated by means of recycling batch reactor and the kinetic model was obtained. Copper-manganese oxides catalysts had better activity and stability for the oxidation of formaldehyde at ambient temperature.Copper-manganese oxide is a strong oxidizability catalysts and can effectively degrade air pollutants, so copper-manganese can be applied to air purification.