用共沉淀法制备了一系列磁铅石型稀土高温燃烧催化剂Ba1-xLaxMnAl11O19-δ,并用XRD、BET和甲烷燃烧活性对其进行了表征.结果表明:用共沉淀法,经过1400℃的高温灼烧,可以制备出单一相β-氧化铝结构的BaMnAl11O19-δ和单一相磁铅石型结构的LaMnAl11O19-δ以及两相共存的部分取代产物,当其组成为Ba0.8La0.2MnAl11O19-δ时活性最好.稀土元素La3+也可以部分替代Ba2+进入其骨架结构的镜面,并能改善其活性.
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