一氧化碳在高温超导体型的Ba_(2-x)Sr_xYCu_3O_(7-α)上的催化氧化  

THE CATALYTIC OXIDATION OF CO OVER Ba_(2-x)Sr_xYCu_3O_(7-α)

作　　者：邓景发[1] 彭颖[1] 蒋安仁[1] 王志宏[1] 

机构地区：[1]复旦大学化学系,上海200433

出　　处：《物理化学学报》1993年第2期206-210,共5页Acta Physico-Chimica Sinica

摘　　要：用粉末XRD法、EXAFS法,激光喇曼散射法、热重法和高真空质谱TPD法研究了超导体型氧化还原催化剂Ba_(2-x)Sr_xYCu_3O_(7-α)(x=0,0.25,0.50,0.75,1.00)的物理化学性质,并用常压连续流动法测定了它们的CO催化氧化活性,得到了催化剂氧化反应活性大小与催化剂的可失氧量(即晶胞中O_I 位置上的氧量)之间存在着线性关系的结论.High temperature oxide superconducters Ba_(2-x)Sr_xYCu_3O_(7-a) (x=0,0.25,0.50,0.75,1.0,1.25)was prepared using high purity BaCO_3,SrCO_3,Y_2O_2,CuO.The super-conducting transition temperature(T_c)of the samples was measured by the four-probe technique for resistivity and alternative current method for magnetic suscepti-bility.The properties of the superconductots were examined by using powder XRDmethod,EXAFS,laser Raman spectroscopy,TG and high vacuum mass spectroscopyTPD.The amount of substitution x is larger,the T_c is lower,the lattice parametersa,b,c and V are smaller and the occupation of oxygen is lower.The catalytic activi-ty of these oxides for CO oxidation was also detected by continuous flow system at1 atm.The easier released oxygen of these oxides O_I,the most active oxygen in thelattice,is the active center in catalytic oxidation by CO.The reaction mechnism is thesame as that of Ba_2YCu_3O_(7-δ).Furthermore,there is a linear relationship between thecatalytic activity and the amount of O_I.

关 键 词：超导体 催化剂 一氧化碳 催化氧化 

分 类 号：O613.71[理学—无机化学]