K_2NiF_4型Eu_(2-x)Sr_xCuO_4稀土复合氧化物的合成、结构及还原特性  

Preparation, Structure and Reductivity of Eu_（ 2-x) Sr_xCuO_4

作　　者：楼辉[1] 刘加庚[1] 刘学建[1] 马福泰[1] 

机构地区：[1]浙江大学化学系,浙江杭州310028

出　　处：《中国稀土学报》2001年第4期324-327,共4页Journal of the Chinese Society of Rare Earths

基　　金：浙江省自然科学基金资助项目 ( 2 92 0 33)

摘　　要：研究了具有K2 NiF4 型结构的Eu2 -xSrxCuO4 复合氧化物的合成、物相结构及其还原特性。发现用络合 凝胶法制备时 ,Eu2 -xSrxCuO4 复合氧化物的生成温度为 110 0℃左右 ,粉末XRD表明Eu2 -xSrxCuO4 复合氧化物属四方晶系 ,空间群为I4/mmm ,其晶胞参数随x的增加而增加。当x≥ 0 7时 ,多余的Sr不能进入晶胞而呈游离的SrO形式存在 ,同时在物相中也存在一定数量的CuO物相。Eu2 -xSrxCuO4 系列复合氧化物对CO和甲烷的催化氧化反应的活性在x较小时随着x的增加而增加。Eu 2- x Sr x CuO 4 complex oxides with structure of K 2NiF 4 type were prepared with complexing gel method. The phase structure and reductivity were studied. The result of XRD measurement indicates that the Eu 2- x Sr x CuO 4 complex oxides belong to tetragonal system with a space group of I4/mmm . The lattice parameters of these complex oxides increase with increasing of Sr added stoichiometrily when x is less than 0 6. When x ≥0 7, the free SrO phase can be detected with XRD because the excess Sr can not enter the lattice. The catalytic activity of the oxidation of CO and methane on these oxides is found and it increases with x increasing when x is not very big.

关 键 词：稀土 Eu2-xSrxCuO4复合氧化物 物相结构 催化活性 甲烷 一氧化碳 催化氧化 催化剂 

分 类 号：O623.11[理学—有机化学] O643.361[理学—化学]