摘要
X射线衍射Rietveld分析和微反分析表明,A位含Dy的A_2BO_4型过渡金属稀土复合氧化物Dy_(0.5)Sr_(1.5)Mn_(1-x)Ni_xO_4(0≤x≤1),是空间群为I4/mmm的四方相K_2NiF_4型结构,A位和B位约有3%至7%的占位无序缺位.健价计算表明,B位Mn的平均价态在3.73至3.77之间,Ni在2.84至2.96之间.对CO氧化催化活性顺序为X=0.2>0.4>0.6>0.8>1. 0.X=0.2的样品,在空速5000h^(-1),463K时,CO转化率达80%.
XRD Rietveld analysis has revealed that Dy0.5Sr1.5NiO4 complex oxide is K2NiF4 type compound, tetragraphic unit cell and space group I4/ mmm . A site and B site were found to exist disorder defects of about 3 % to 7 % . The average bond - valences of Mn and Ni in the B sites, which were deduced from bond length by using bond - Valence relation, are about 3. 8 and 2.9, respectively. The order of catalytic activity on CO oxidation is as follows: x = 0.2>0.4> 0.6>0.8>1.0>0.0,the efficiency of CO oxidation for x =0.2 is 80% at 463K and a gas space velocity of 5000h-1.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1996年第7期667-672,共6页
Acta Chimica Sinica
基金
浙江省自然科学基金资助项目
