Effect of calcination process on performance of 3DOM CeMnO3 catalysts  

作　　者：Xin Liu Xinyi Lv Yongqiang Wang Chaocheng Zhao Fang Liu 

机构地区：[1]College of Chemical Engineering,China University of Petroleum(East China),Qingdao 266580,China [2]State Key Laboratory of Petroleum Pollution Control,China University of Petroleum(East China),Qingdao 266580,China

出　　处：《Journal of Rare Earths》2021年第9期1073-1081,共9页稀土学报（英文版）

基　　金：Project supported by Natural Science Foundation of Shandong Province(ZR2019MEE112)。

摘　　要：A series of 3DOM CeMnO3 perovskite catalysts were prepared by poly(methyl methacrylate)hardtemplating-excessive impregnation method at calcination temperature of x℃(x=600,700,800)and the heating rate of y℃/min(y=1,2,5,10).The samples were characterized by Brunauer-Emmett-Teller method,scanning electron microscopy,transmission electron microscopy,H2-temperature programmed reduction,X-ray photoelectron spectroscopy,X-ray diffraction,moreover,the effect of the calcination process on the catalytic activity of the samples were discussed by the catalytic combustion of toluene.The results show that the 3DOM CeMnO3 catalysts calcined at 600℃promote the formation of a perovskite structure,inhibit the reduction of the Mn4+species in the catalyst with high temperature.The catalyst expresses the complete macroporous structure,large specific surface area(38.8 m^(2)/g),higher adsorption oxygen concentration and Mn4+substance concentration,with a low T90%=172℃.By preparing the catalysts at different calcination heating rates,it can be concluded that the catalyst possesses a high concentration of adsorbed oxygen and a low reduction temperature and a large specific surface area(40.42 m^(2)/g)greatly promotes adsorption stage catalytic oxidation reaction and catalytic combustion of toluene at low temperature under the heating rate of 5℃/min.When the heating rate is 1℃/min,the catalyst has a complete macroporous structure(>250 nm),which is beneficial to the exchange of macromolecular substances during the catalytic reaction and the catalyst has a high concentration of lattice oxygen suitable for the catalysis of toluene in high temperature flue gas combustion.

关 键 词：Three-dimensionally ordered macroporous Perovskite catalyst Calcination temperature Calcination heating rate Rare earths 

分 类 号：TQ426[化学工程] X701[环境科学与工程—环境工程]