La2-xSrxCuO4±λ系列催化剂的合成、表征及NO分解催化性能的研究
SYNTHESIS, CHARACTERIZATION AND CATALYTIC BEHAVIOUR OF La2-xSrxCuO4±λ FOR DECOMPOSITION OF NO
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摘要: 合成了x值不同的La2-xSrxCuO4±λ(x=0.0—1.0)系列复合氧化物催化剂.用XRD、IR,XPS和化学分析等方法对催化剂的组成、结构进行了表征,并对NO分解的催化性能和作用机理进行了研究.结果表明:在x=0.0—1.0范围内.所有样品都具有A2BO4结构.发现NO分解活性与氧空位(缺陷)的浓度有关,与不同价态的Cu离子含量之间无直接关系.
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关键词:
- 一氧化氮 /
- 镧-锶-铜复合氧化物 /
- 催化分解
Abstract: A series of La2-xSrxCuO4±λ mixed oxides with various composition (x = 0.0-1.0) have been prepared. The composition and structure of the catalysts were characterized by means of XRD, IR, XPS, chemical analysis and so on. The catalytic activity and mechanism for the decomposition of nitrogen monoixde have been investigated. The results show that all catalysts have the structure with A2BO4 in the range of x= 0.0-1.0. It has been found that the activity for the decopmosition of NOis closely correlated with the concentration of oxygen vacancies; but it is neither parallel with the content of Cu3+ nor with that of Cu2+. -
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