Based On Catalytic Combustion Properties Of Catalyst Copper Manganese Cerium Oxide

VOCs is an important source of atmospheric pollution,which can cause serious air pollution problems,such as photochemical pollution,ozone damage,haze.These problems have a great impact on the human living environment.Catalytic combustion technology because of its low energy consumption,no secondary pollution and other advantages are widely used.For the VOC emission control,the key to VOCs catalytic combustion technology is good catalyst.but the noble metal catalysts widely used in current industrial processes is expensive and have poor stability.Therefore,it is necessary to research low price and excellent activity of VOCs catalyst.Copper oxide,manganese oxide and ceria are stable and cheap,but their catalytic performance still needs to be further improved.In this paper,three series of composite oxide catalysts containing copper,manganese and cerium were prepared,and the catalytic activity to VOCs was tested.N2 desorption,XRD,SEM and H2-TPR were used to analyze the catalytic mechanism of the catalyst,and the catalytic with the best catalytic performance was determined.In this paper,the effects of catalyst preparation methods,ratio of active components,calcination temperature and space velocity on the catalytic activity to VOCs.were investigated.The optimal preparation scheme of Mn-Ce composite oxide catalyst was determined as follows:Mn:Ce = 0.3:0.7;the catalyst preparation method adopts coprecipitation method;the calcination temperature of the catalyst is 650?.In this paper,it is verified that the working conditions of space velocity have a great influence on the catalytic activity of Mn-Ce composite oxide catalyst,which will increase the complete conversion temperature of VOCs in the experiment.The results show that:?1?Mn-Ce solid solution formed in Mn-Ce composite oxide catalyst may be beneficial to the catalytic activity of the catalyst.?2?The catalyst prepared by coprecipitation method has a high specific surface area,and the surface active components are dispersed more uniformly,have good pore structure and better redox ability.?3?The increase of the calcination temperature of the catalyst is beneficial to the activity of the catalyst,and the high calcinations temperature may lead to the aggregation and even collapse of the catalyst active components,thus affecting the catalytic performance of the catalyst.In this paper,copper-cerium series and copper-manganese series catalysts were prepared under the optimum preparation conditions.Under the condition of toluene inlet concentration of 500ppm and space velocity of 30000h-1,the catalytic performance of these two series of catalysts was investigated.The results show that Cu:Ce = 0.3:0.7 has the best catalytic activity for toluene?T90 = 229 ??in copper cerium series catalysts.In the copper?manganese series catalyst,Cu:Mn = 0.25:0.75 catalyst showed the best catalytic activity of toluene?T90 = 202 ??.The results of the activity test showed that,?1?Cu-Ce composite oxide catalysts are slit mesoporous structures in Cu-Ce series catalysts,and there is a good synergistic effect between CuO and CeO2,which is favorable for oxidation-reduction performance and catalytic performance.A suitable proportion of the copper-cerium mixture can be obtained by dispersing the active ingredient uniformly,the size and shape of the more regular catalyst to enhance the catalyst's specific surface area and pore volume.?2?In the Cu-Mn series catalysts,the Cu-Mn composite oxide catalysts have mesoporous structure,and the copper-manganese elements in the catalysts have strong interaction,and the spinel structure is detected in the catalyst,to improve the redox performance of the catalyst,which improves the redox performance and catalytic performance of the catalyst.In this paper,the catalytic activity for toluene and ethyl acetate of the catalyst with best structure and performance in copper manganese,copper cerium and manganese cerium three series of catalysts,The catalyst with Cu:Mn = 0.25:0.75 was the best catalyst for the catalytic activity,The complete conversion temperature of toluene at a feed concentration of 500 ppm was 202? at a space velocity of 30000 h-1 and the complete conversion temperature of ethyl acetate at a feed concentration of 1000 ppm was 212? at a space velocity of 30000 h^-1.