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采用溶胶-凝胶方法合成了Cu,Zn,Ni改性的钙钛矿复合氧化物系列催化剂.X射线衍射分析表明,750℃焙烧的此类催化剂在掺杂范围内均具有钙钛矿基本结构.红外光谱分析表明,Cu,Zn,Ni掺入后没改变钙钛矿型的晶体结构,只是随着Cu掺杂量的增加,571cm-1附近的谱带整体趋势是向波数方向移动.在实验条件下,对NO的活性测试结果表明,La0.9Ce0.1Fe0.8-xCo0.2YxO3(Y=Cu,Zn,Ni)系列催化剂在600～800℃范围内,掺杂Cu的复合氧化物具有较高的催化分解活性,其转化率始终保持在80%以上,反应温度为750℃时,几乎100%转化.H2-TPR结果证明,其催化分解活性高的原因是Cu的掺入使晶格氧活动性增强.
A series of catalysts of perovskite-type composite oxides modified by Cu, Zn and Ni were synthesized by sol-gel method.X-ray diffraction analysis showed that the catalysts calcined at 750 ℃ have the basic structure of perovskite Infrared spectrum analysis showed that the crystal structure of perovskite did not change after the addition of Cu, Zn and Ni, but with the increase of Cu doping, the overall trend of the band near 571cm-1 shifted to wavenumber direction. Under the experimental conditions, the results of NO activity test showed that the Cu-doped composite oxides with La0.9Ce0.1Fe0.8-xCo0.2YxO3 (Y = Cu, Zn, Ni) High catalytic decomposition activity, the conversion rate is always maintained at above 80%, the reaction temperature is 750 ° C, almost 100% conversion .H2-TPR results show that the catalytic decomposition activity is high because of the incorporation of Cu lattice Oxygen activity increased.