采用改进的溶胶-凝胶法制备了Ba-Fe-O(Ba/Fe原子比为0.5),Ba-Ce-O(Ba/Ce原子比为1)和Ba-Sn-O(Ba/Sn原子比为1)氧化物,并考察了其储氮性能. 结果表明,750 ℃焙烧的Ba-Fe-O样品,在400 ℃下的NOx储存容量(NSC)最大,其次为900 ℃焙烧的Ba-Ce-O样品; 相同温度焙烧的样品,在400 ℃下的NSC均大于200 ℃下的NSC. XRD测试结果表明,750 ℃焙烧的Ba-Fe-O样品的缺陷钙钛矿BaFeO3-δ可能是储存NOx的主要活性相,而Ba-Ce-O和Ba-Sn-O样品储存NOx的活性相分别为钙钛矿型BaCeO3和BaSnO3. BET测定结果表明,样品的比表面积均较小. 用FT-IR分析了Ba-Fe-O样品上储存的NOx物种. 讨论了NSC大小与吸收温度、NOx吸收物种及样品物相之间的关系.
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