In order to solve the problem of over-limit of CO in the exhaust gas of explosion-proof diesel engine in coal mine,the monolithic CO catalyst with different ratio of Cu and Ce was prepared by solution impregnation method with oxalic acid and alumina sol.The performance of the catalyst was optimized by potassium permanganate modification and transition metal doping.The experimental results showed that the catalyst with a copper cerium ratio of n(Cu)∶n(Ce)=5∶5,modified with 0.15 mol/L potassium permanganate,and doped with 0.3 mol/L cobalt nitrate exhibited the best CO catalytic effect,with a maximum CO conversion rate of 100% at 165℃.Based on the results of catalyst performance testing,the specific surface area,pore characteristics,elemental changes,reduction characteristics,and CO adsorption characteristics of the catalyst were studied using N2 adsorption desorption,XPS,H2-TPR,and CO-TPD.The influence mechanism of potassium permanganate modification and transition metal ion doping on the catalytic performance of the catalyst was analyzed in depth.The research results have enriched the research work on CO catalysts and have certain guiding significance for addressing the problem of CO exceeding the limit in the exhaust gas of explosion-proof diesel engines in coal mines.
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