Surface structure and catalytic performance of Sr-doped La_2NiAlO_6 double perovskite catalysts for methane combustion  

作　　者：胡瑞生 白雅琴 杜航宇 张慧敏 杜燕飞 张俊阁 周啟华 

机构地区：[1]School of Chemistry and Chemical Engineering,Key Laboratory of Rare Earth Materials,Inner Mongolia University [2]Department of Chemical Engineering,Hohhot Vocational College

出　　处：《Journal of Rare Earths》2015年第12期1284-1292,共9页稀土学报（英文版）

基　　金：supported by the Scientific and Technological Planning of Inner Mongolia Hohhot Scientific and Technological Bureau(2012-I-1-1);National Natural Science Foundation of China(21263008);State Key Laboratory of Chemical Resource Engineering in Beijing University of Chemical Technology(CRE-2014-C-304)

摘　　要：A species of novel St-doped rare earth double perovskite catalysts （La2 xSrxNiA106, x=0, 0.1） were prepared by the sol-gel method using citric acid as a complexing agent and calcined at 1100 ℃ for 3 h, then investigated for methane catalytic combustion. The as-prepared catalysts were characterized by X-ray diffraction patterns （XRD）, H2-temperature-programmed reduction （H2-TPR）, specific surface area （BET）, magnetic property measurement technology （M-H）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）. Experimental results showed that Lal.9Sr0.1NiA106 catalyst exhibited significantly improved catalytic activity （T10=378.7 ℃, T90=602.9 ℃） compared with that of La2NiAIO6, whose T10 decreased by 74.4 ℃ and T90 decreased by 66.8 ℃, respectively. The excellent catalytic activity of Lal.9Sr0.tNiA106 caused by Sr-doping could be explained by the larger number of adsorption oxygen on the catalyst surface, which could be proven by XPS analysis.A species of novel St-doped rare earth double perovskite catalysts （La2 xSrxNiA106, x=0, 0.1） were prepared by the sol-gel method using citric acid as a complexing agent and calcined at 1100 ℃ for 3 h, then investigated for methane catalytic combustion. The as-prepared catalysts were characterized by X-ray diffraction patterns （XRD）, H2-temperature-programmed reduction （H2-TPR）, specific surface area （BET）, magnetic property measurement technology （M-H）, scanning electron microscopy （SEM）, and X-ray photoelectron spectroscopy （XPS）. Experimental results showed that Lal.9Sr0.1NiA106 catalyst exhibited significantly improved catalytic activity （T10=378.7 ℃, T90=602.9 ℃） compared with that of La2NiAIO6, whose T10 decreased by 74.4 ℃ and T90 decreased by 66.8 ℃, respectively. The excellent catalytic activity of Lal.9Sr0.tNiA106 caused by Sr-doping could be explained by the larger number of adsorption oxygen on the catalyst surface, which could be proven by XPS analysis.

关 键 词：rare earths double perovskite methane catalytic combustion sol-gel method 

分 类 号：O643.36[理学—物理化学] O621.251[理学—化学]