锰铈复合氧化物用于NO催化氧化的研究  

Catalytic oxidation of NO to NO_2 on Mn-Ce-O_x catalyst

作　　者：王先涛[1] 马宏燎[1] 柏子龙[1] 

机构地区：[1]华东理工大学化工学院,上海200237

出　　处：《现代化工》2017年第3期92-95,共4页Modern Chemical Industry

摘　　要：利用溶胶-凝胶法制备Mn-Ce-O_x催化剂,考察了锰铈摩尔比和焙烧温度对催化剂催化氧化NO活性的影响,并对空速和稳定性进行了探究。结果表明,锰铈摩尔比为1,焙烧温度为300℃和400℃时,催化剂的NO氧化活性最佳。不同焙烧温度的催化剂中,400℃焙烧,催化剂呈片状结构,比表面积最大,可达113.8 m^2/g;其具有良好的稳定性,在NO体积分数为600μL/L,O_2的体积分数为4%,N2作平衡气,空速为480 000 m L/(g·h),反应温度为260℃时,NO催化氧化活性最高可达89%;进一步增大空速至960 000 m L/(g·h),相同反应条件下,NO催化活性最高可达69%。A series of Mn-Ce-Oxcatalysts are synthesized by sol-gel method and employed for catalytic oxidation of NO to NO2. The effects of the ratio of Mn/Ce and calcination temperature on the catalytic activity of Mn-Ce-Ox catalysts are investigated. Their gaseous hourly space velocity（ GHSV） and stability are also studied. The results suggest that MnCe（ 1）-Ox-300 and Mn-Ce（ 1）-Ox-400 have the best catalytic activity when the Mn/Ce ratio is 1,the calcination temperature is 300℃ and 400℃. The Mn-Ce（ 1）-Ox-400 calcined at 400℃ has a 2D irregular sheet structure with the largest BET specific surface area of 113. 8 m2/ g. Furthermore,the obtained Mn-Ce（ 1）-Ox-400 has excellent stability. NO conversion can reach up to 89% under the following conditions： 600 μL/L of NO,4% of O2,N2 as balance gas,480 000 m L /（ g·h） of GHSV and 260℃ of reaction temperature. When the GHSV is further raised to 960 000 m L /（ g·h）,NO conversion can still reach up to 69%.

关 键 词：锰铈复合氧化物 一氧化氮 催化氧化 空速 

分 类 号：TQ032[化学工程]