Composite Carrier Load Type Catalyst Preparation And Microwave Assisted Catalytic Oxidation Of Toluene Performance Test Research

Volatile organic compounds (VOCs) are a major source of ambient air pollution. Catalytic oxidation process is a hot research topic for VOCs treatment due to its high efficiency, thoroughly oxidation and without selective advantages. Used in catalytic oxidation of traditional electric heating heat is not send out in time, warming and cooling shortcomings such as slow process, which reduces the activity of catalyst and the removal efficiency of VOCs. Due to microwave heating has the advantages of starting fast, uniform heating, will replace electric heating with microwave heating is a kind of reasonable solutions and new research directions. But microwave heating are selectivity, only cause microwave electric loss and magnetic loss material will be heated, the traditional electric heating under the catalyst has good catalytic activity probably because its absorbing capacity and activity under microwave heating.Therefore, microwave heating was applied to VOCs exhaust gas catalytic oxidation treatment, selection of catalyst is the key, the pros and cons of its performance on the VOCs degradation efficiency and process energy consumption has a decisive influence. Paper in a typical VOCs toluene as the research object, carry out experimental research of microwave assisted catalytic oxidation of toluene. Mainly to the absorbing of high stability, high active catalyst, by microwave heating under the degradation of toluene catalytic oxidation effect inspects the catalytic activity of the catalyst, through related characterization tests to examine the structure of the catalyst. In order to through this article research for the research of new technology of microwave assisted catalytic oxidation VOCs valuable foundation for application.On the basis of experimental research work, this paper concluded the following main research results. (1) Microwave heating combined with catalytic oxidation method can efficiently remove volatile organic compounds (toluene, compared with traditional tube furnace heating, microwave heating under the catalyst can be totally under lower reaction temperature catalytic oxidation of toluene, showing much higher catalytic activity. Tube furnace heating process generated by the heat of reaction is not easy to make the bed temperature rise obviously, cause catalyst reunite and active component on the surface, which reduces the activity of catalysts.(2) Catalyst support for different manufacturers, and the order of its absorbing activity, adsorption and catalytic oxidation of toluene is the self-made composite carrier (zhejiang ninghai yuanda)>5A molecular sieve (tianjin blessed morning)> activated alumina (Shanghai national medicine); Catalyst carrier wave absorption capacity and adsorption performance is stronger, the more help to microwave assisted catalytic oxidation of toluene, the experimental study on the selection of zhejiang ninghai great homemade compound (mixed with silicon carbide micro powder) as the best carrier catalyst carrier.(3) Cu-Mn-Ce/3%SiC composite carrier of optimizing the preparation conditions of catalysts for:kaolin do adhesive (kaolin:molecular sieve powder=1:3), mixed with3%SiC,Cu:Mn=1:1(mass ratio, load amount of5%each) and cerium doped with1.67%, roasting temperature is500℃, roasting time is8h, under the condition of the preparation, catalyst showed good catalytic activity.(4) Microwave assisted catalytic oxidation of toluene degradation orders are Cu-Mn-Ce/3%SiC composite carrier> Cu-Mn-Ce/composite carrier> Cu-Mn-Ce/5%SiC composite carrier Cu-Mn-Ce/10%SiC composite carrier> self-made composite carrier. Study found that mixed with proper amount of copper, manganese, silicon carbide and load of cerium catalytic efficiency is higher than not join copper, manganese, silicon carbide only load cerium catalyst, but silicon carbide doped amount gradually increases, reduced the load of active components and distribution, makes the catalytic efficiency decline. Reaction temperature210℃, Cu-Mn-Ce/3%SiC composite carrier catalyst microwave assisted catalytic oxidation of toluene conversion rate can reach more than95%.(5) Experiments to determine the optimal operation parameters:air flow rate is 0.08m3/h, the toluene concentration of1500mg/m3; Through the Cu-Mn-Ce/3%SiC composite carrier catalyst48h of continuous microwave assisted catalytic oxidation of toluene experimental results show that the removal rate of toluene remained above92%. This shows Cu-Mn-Ce/3%SiC composite carrier catalyst has good catalytic activity and stability.