新型高比表面积ε-MnO_(2)基化合物的制备及其用于甲苯催化燃烧性能研究  

Study on preparation of novel ε-MnO_(2)-based compounds with high specific surface area and their performance for toluene catalytic combustion

作　　者：张超[1,2] 敬方梨 康辉 李学东 储伟[1,2] ZHANG Chao;JING Fangli;KANG Hui;LI Xuedong;CHU Wei(School of Chemical Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Institute of New Energy and Low Carbon Technology,Sichuan University,Chengdu 610207,Sichuan,China;School of Architecture and Environment,Sichuan University,Chengdu 610000,Sichuan,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学新能源与低碳技术研究院,四川成都610207 [3]四川大学建筑与环境学院,四川成都610000

出　　处：《低碳化学与化工》2023年第1期125-132,共8页Low-Carbon Chemistry and Chemical Engineering

摘　　要：Mn基氧化物因其优异的物理化学性能而被广泛应用于催化材料中,然而低温高效锰基氧化物催化剂的开发仍然存在较大的困难。通过用酸处理由氧化还原-共沉淀法快速合成的LaMnO_(3)钙钛矿(Bulk LaMnO_(3))制得y-MnO_(2)/LaMnO_(3)催化剂(y为酸处理时间),并研究了催化剂的甲苯催化燃烧性能。结果表明,酸处理可选择性溶解Bulk LaMnO_(3)中的A-位点(La^(3+)),暴露出更多B-位点(Mn3+)并氧化生成Mn^(4+)。其中,1-MnO_(2)/LaMnO_(3)催化剂的比表面积(279.2 m^(2)/g)较Bulk LaMnO_(3)(30.61 m^(2)/g)增大9倍左右。此外,酸处理使催化剂的活性晶格氧及Mn3+含量提高,进而使催化性能增强,1-MnO_(2)/LaMnO_(3)催化剂的甲苯转化率达到90%的温度降低至248℃。Mn-based oxides are widely used in catalytic materials because of their excellent physical and chemical properties.However, it is still difficult to develop low temperature and high efficiency Mn-based oxides catalysts. In this paper, y-MnO_(2)/LaMnO_(3)catalyst(y is the acid treatment time) was prepared by acid treatment of LaMnO_(3)perovskite(Bulk LaMnO_(3)), which was quickly synthesized by reoxidation-coprecipitation method, and the catalytic combustion performance of toluene was studied. The results show that acid treatment can selectively dissolve A-site(La^(3+)) in Bulk LaMnO_(3)and expose more B-site(Mn3+) and oxidize to form Mn^(4+).The specific surface area of 1-MnO_(2)/LaMnO_(3)catalyst(279.2 m^(2)/g) is about 9 times larger than that of Bulk LaMnO_(3)(30.61 m^(2)/g).In addition, acid treatment increases the content of oxygen and Mn^(3+) in the active lattice of the catalyst, which further enhances the catalytic performance. The temperature of toluene conversion rate of 1-MnO_(2)/LaMnO_(3)catalyst reaching 90% decreases to 248 ℃.

关 键 词：Mn基催化剂 甲苯催化燃烧 氧化还原-共沉淀 比表面积 

分 类 号：TQ53[化学工程—煤化学工程]