Preparation of Different Metal Substituted Hexaaluminate and Its Catalytic Performance of Methane Combustion  

作　　者：Li Shunqing Zou Guojun Wang Xiaolai 

机构地区：[1]State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Journal of Rare Earths》2006年第5期523-523,共1页稀土学报（英文版）

摘　　要：Different metal substituted hexaaluminate catalysts （Ba0.8 La0.2 MAl11 O19-α） were the M = Mn, Fe, Co, Cu were prepared using alumina sol as the （NH4）2CO3 coprecipitation precursor and supercritical drying （SCD） method. Meanwhile the catalysts were characterized using BET, XRD, TEM, UV-Vis-DR and O2-TPD techniques. The rod-like hexaaluminate nanoparticles with high surface area ranging from 42 to 73 m^2·g^-1 were obtained after calcinations at 1200℃. The XRD results reveal that the main crystal phase of the catalyst is hexaaluminate and small amount of α-Al2O3 existed except for Ba0.8La0.2MnAl11O19-α catalyst. Moreover, the UV-Vis-DR results verify that Fe^3＋ , Mn^3＋ occupy the Oh sites in the hexaaluminate structure while Co^3＋ , Cu^2＋ locate at the Oh and Td sites.Different metal substituted hexaaluminate catalysts （Ba0.8 La0.2 MAl11 O19-α） were the M = Mn, Fe, Co, Cu were prepared using alumina sol as the （NH4）2CO3 coprecipitation precursor and supercritical drying （SCD） method. Meanwhile the catalysts were characterized using BET, XRD, TEM, UV-Vis-DR and O2-TPD techniques. The rod-like hexaaluminate nanoparticles with high surface area ranging from 42 to 73 m^2·g^-1 were obtained after calcinations at 1200℃. The XRD results reveal that the main crystal phase of the catalyst is hexaaluminate and small amount of α-Al2O3 existed except for Ba0.8La0.2MnAl11O19-α catalyst. Moreover, the UV-Vis-DR results verify that Fe^3＋ , Mn^3＋ occupy the Oh sites in the hexaaluminate structure while Co^3＋ , Cu^2＋ locate at the Oh and Td sites.

关 键 词：METHANE catalytic combustion HEXAALUMINATE supercritical drying rare earths 

分 类 号：TQ426.91[化学工程]