Preparation And Performance Study Of Catalytic Combustion Catalyst To VOCs Under Microwave Irradiation

In recent years,more and more people pay attention to environmental pollution.In the air pollution factors,the volatile organic compounds(VOCs)pollution has gradually been people's attention.There are many technologies to deal with the VOCs.Combustion method has become a research hotspots because of its high treatment efficiency to VOCs.But the traditional way of heating the catalyst existence some defects.One is that the catalyst is heated unevenly.Secondly,the catalyst heating and cooling process is slow.These factors restrict the catalytic combustion activity of the catalyst and the treatment effect of VOCs.Microwave heating has the advantages of fast heating rate and uniform heating.It has the potential to replace the traditional heating method.In this paper,copper-manganese-cerium composite metal oxide was prepared by sol-gel method using silicon carbide as carrier.At the same time,platinum oxide supported on titania was used as catalyst loading on the silicon carbide.In this paper,toluene was selected as the treatment object,and the catalytic combustion of toluene was studied by microwave.The influence of microwave absorbing properties of the catalysts loading were investigated.The firmness of the catalyst coating was studied.The catalytic activity of the catalyst to toluene and the effect of different process parameters were also investigated.The catalysts were characterized by X-ray diffraction,scanning electron microscopy,specific surface area measurement and thermogravimetric analysis.The effects of microwave heating and conventional electric heating on the catalytic activity were also compared.Studies indicates that the loading of the catalyst has little effect on the microwave absorbing properties of silicon carbide.The catalyst adheres firmly to the surface of the silicon carbide.Both catalysts showed good catalytic activity in the microwave field.90%toluene was removed at 280? after copper-manganese-cerium oxide supported on silicon carbide,and 90% toluene was removed at 220? after loading Pt/TiO2.Compared with microwave heating and electric heating,it can be seen that the removal efficiency of microwave heating is 20%-50% higher at the same temperature.The catalytic performance is better and the energy consumption is lower.At the same time,we designed the catalytic oxidation VOCs gas purifying device under microwave field and provide a basis for its application in the industry.