【摘要】 采用氧化还原共沉淀法制备系列不同配比的锰铈复合氧化物,用于CO和CH4催化氧化,考察不同焙烧温度对催化剂性能的影响。研究表明,焙烧温度500℃和Mn与Ce物质的量比为5∶5的催化剂具备最优的CO和CH4催化氧化性能。催化剂在90℃时,CO转化率可达100%;对于CH4催化氧化,反应温度500℃时,CH4转化率为80%。通过N2吸附-脱附、H2-TPR和XRD等研究其物化结构性能,结果表明,在系列催化剂中,焙烧温度500℃和Mn与Ce物质的量比为5∶5的催化剂具有最高的比表面积和最活泼的晶格氧,可能是其具有优异催化活性的原因。更多还原

【Abstract】 A series of Mn-Ce composite oxide catalysts with different Mn / Ce ratios was prepared by redox co-precipitation method and used for CO and CH4 catalytic oxidation. The effects of calcination temperatures on the catalyst performance were investigated. The results revealed that the catalyst with Mn / Ce molar ratio of 5∶ 5 and calcined at 500 ℃ exhibited the optimal activity for CO and CH4 catalytic oxidation. CO conversion of 100% on the catalyst was obtained at 90 ℃,and CH4 conversion of 80% was attained at reaction temperature 500 ℃. The physicochemical and structural properties of the catalysts were characterized by means of N2adsorption-desorption,H2-TPR and XRD. The characterization results showed that the catalyst with Mn / Ce molar ratio of 5∶ 5 and calcined at 500 ℃ possessed the largest surface area and the most active lattice oxygen,which could be the major reasons for leading to its remarkable catalytic activity.更多还原