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化学学报
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化学学报 ›› 1996, Vol. 54 ›› Issue (7): 667-672. 上一篇    下一篇

研究论文

A2BO4型复合氧化物Dy0.5Sr1.5Mn1-xNixO4(0<=x<=1)的Rietveld分析和CO氧化催化活性

吕光烈;操来章;楼辉;马福泰   

  1. 杭州大学材料结构研究所
  • 发布日期:1996-07-15

Rietveld analysis and catalytic activity on CO oxidation of A2BO4 type complex oxide Dy0.5Sr1.5Mn1-xNixO4(0<=x<=1)

LU GUANGLIE;CAO LAIZHANG;LOU HUI;MA FUTAI   

  • Published:1996-07-15

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X射线衍射Rietveld分析和微反分析表明, A位含Dy的A2BO4型过渡金属稀土复合氧化物Dy0.5Sr1.5Mn1-xNixO4(0<=x<=1), 是空间群为I4/mmm的四方相K2NiFe型结构, A位和B位约有3%至7%的占位无序缺位。键价计算表明, 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%。

关键词: 氧化, 一氧化碳, Ｘ射线衍射分析, 氧化锰, 氧化镍, 复氧化物, 氧化锶, 化学计量学, 催化活性, 氧化镝

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.

Key words: OXIDATION, CARBON MONOXIDE, X-RAY DIFFRACTION ANALYSIS, MANGANESE OXIDE, NICKEL OXIDE, DOUBLE OXIDE, STRONTIUM OXIDE, STOICHIOMETRY, CATALYTIC ACTIVITY, DYSPROSIUM OXIDE

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