LaCoO3 perovskite catalyst was prepared by citric acid complex method and characterized for its physic - chemical properties. Catalytic performance in the SCR of NO, by NH3 was studied and results showed that: pure LaCoO3 granule has a certain ability of catalytic reduction of NOx, especially between 250 to 45℃. However, the undesired catalytic activity for the oxidation of NH3 was too high and could be even largely promoted by a higher temperature. When LaCoO3 was used as SCR catalyst, it showed a certain degree of purification ability of NOx, below 400℃ , but if the temperature was higher than 400℃ , NOx elimination is deteriorated. Moreover, LaCo03 perovskite catalyst was highly capable of enhancing the oxidation of HC and CO regardless of their gas compositions.%采用柠檬酸络合法制备了LaCoO3钙钛矿型催化剂.对其理化特性及NH3-选择性催化还原催化性能的研究结果表明:纯LaCoO3颗粒具有一定的NOx催化还原能力,在250～450℃活性较高；但该催化剂对NH3具有较高的氧化活性,且催化活性随反应温度的升高而提高；在SCR反应中,在400℃以下时,该催化剂显示出一定的NOx净化能力,但当温度超过400℃以后,还原剂的加入反而恶化了NOx排放.不管反应气组成如何,LaCoO3钙钛矿型催化剂对HC和CO都具有良好的催化性能.
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