采用共沉淀法合成了不同摩尔投料比(Mg/Al/Cu)的碳酸根型水滑石,用X-射线、红外光谱、热重-差热分析对水滑石进行了表征,测定对NOx的吸附性能.结果表明,Mg/Al/Cu摩尔比为2.5∶1∶0.5,2∶1∶1,1∶1∶2时合成的复合氧化物中都具有"feitknecht"结构.热重-差热分析结果显示合成样品的分解均有两个过程,掺入铜量少,热稳定性高.Mg/Al/Cu为2.5∶1∶0.5的水滑石对氮氧化物的吸附容量为1484.4mg/g.
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