Study On The Performance And Stability Of Catalytic Oxidation Of Toluene By Low Platinum Alloy Catalyst

At this stage,the rapid progress of economicalization has also brought a large amount of industrial waste gas emissions,resulting in serious pollution of the atmospheric environment.As a typical representative of organic gas pollutants,toluene has caused great harm to human health.In the current research field of treatment of toluene gas pollutants,the use of catalytic oxidation method can not only efficiently decompose toluene,but also will not produce secondary pollutants during the reaction process.Therefore,this method can be widely used in industrial production.The choice of catalyst is the top priority in the process of catalytic oxidation of toluene.Selecting an excellent catalyst can achieve the purpose of controlling toluene emissions,and at the same time reduce the energy consumption and material cost of tail gas treatment.The main research direction of this paper is to find and synthesize new catalysts for catalytic oxidation of toluene.The main contents include:(1)Explore the synthesis of PtCo3 and support it on carbon black to form PtCo3-C,which is used as a catalyst for catalytic oxidation of toluene,and its performance in catalytic oxidation of toluene is studied,including the activity,catalytic life,water resistance and carbon dioxide resistance.The experimental results show that PtCo3-C has high activity for catalytic oxidation of toluene(completely decomposes 1000 ppm of toluene at 238℃),long catalytic life(at least 120 h),excellent water resistance and carbon dioxide resistance.(2)The physicochemical properties of PtCo3-C were explored by various characterization methods(including XRD,XPS,ICP,TEM,SEM,etc.)and experimental techniques(including isobaric adsorption experiments,thermogravimetric experiments,etc.).The catalytic oxidation mechanism,water resistance and carbon dioxide resistance performance and kinetics of PtCo3-C were analyzed by infrared experiments,DFT molecular simulation calculation and Arrhenius model.(3)The catalyst was optimized by replacing the carrier.Specifically,the more environmentally friendly and lower-cost biomass carbon NC900 was used as the carrier,and the PtCo3-NC900 was prepared by using physical ultrasonic loading.The catalytic oxidation of toluene was studied,and the experimental results showed that the catalytic activity of PtCo3NC900 was better than that of PtCo3-C.The temperature at which toluene is completely decomposed can be reduced by nearly 30℃.(4)The mechanism of the catalytic activity of PtCo3-NC900 being better than that of PtCo3-C was explored and analyzed.It mainly includes the physical and chemical properties of the comparative materials(specific surface area,pore size distribution,chemical element valence distribution,appearance,etc.)and the experimental test of the material’s ability to adsorb toluene under the same conditions.The results show that PtCo3NC900 has more abundant pore structure,larger specific surface area,more abundant nitrogen functional groups and better toluene adsorption capacity,which may be the reasons for catalytic activity of PtCo3-NC900 is better than PtCo3-C.In this paper,a bimetallic catalyst PtCo3 with excellent lowtemperature catalytic activity,strong stability,strong water resistance and strong carbon dioxide resistance was synthesized.A new option for lowcost and high-efficiency decomposition of toluene is presented,and a new idea is provided for the research on bimetallic catalytic oxidation of toluene.