钴铝\镁铝水滑石的热稳定性能及其氧化物的结构研究  

The research of the structure and heat stability of CoAl-HT/MgAl-HT and oxide powder

作　　者：王滔[1] 王安琪[1] 余丰[1] 吴秀玲[1,2] 孟大维[1,2] 刘晓旸[2] 

机构地区：[1]中国地质大学材料与化学学院,湖北武汉430074 [2]吉林大学化学学院,无机合成与制备化学国家重点实验室,吉林长春130012

出　　处：《功能材料》2012年第9期1200-1203,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(41172051;40872039);中国地质大学"李四光创新人才计划"资助项目(2010-16);全国大学生创新训练资助项目(111049113);英才工程计划资助项目(2010-K5)

摘　　要：采用溶液共沉淀法合成了CoAl-HT和MgAl-HT水滑石,在800℃下煅烧4h得到了钴铝和镁铝尖晶石氧化物粉体。利用XRD、FT-IR和TG对水滑石及其氧化物粉体的结构和热稳定性能进行了表征分析。从XRD和FT-IR分析结果可知,所得产品为层板水滑石物质,且结晶性良好,从CoAl-HT和MgAl-HT结果对比可知,镁铝组合更容易形成水滑石结构;由氧化物粉体的XRD分析结果可知,在800℃下两者都形成了尖晶石结构,且钴铝氧化粉体尖晶石无杂相,结晶性更好;TG曲线呈现了两个样品的水滑石热学性能,通过对比可知,MgAl-HT在216和372℃下分解而CoAl-HT在197和243℃下分解说明MgAl-HT比CoAl-HT具有更好的热稳定性能。CoAl-HT and MgAl-HT samples were prepared by the method of coprecipitation. Then they were calcined in 800℃ for 4h to give spinel oxide powder. After that the structure and heat stability were characterized by the methods of powder X-ray diffraction （XRD）, Fourier transform infrared spectroscopy （FT-IR）, simultaneous thermogravimetry analysis （TG）. The results of XRD and FT-IR showed that the typical diffraction peaks, which proved the formation of layered structure of HT and the crystal form of MgAl-HT was better than of CoAI-HT, were observed and compared in two samples . The XRD results of oxide powder showed that the spinel structure was formed in two samples . And the structure of CoAl2O4 was more perfect than of MgAl2 O4. Besides TG showed that MgAl-HT is higher heat stability than CoAl-HT.

关 键 词：钴铝水滑石 镁铝水滑石 结构 热稳定性 

分 类 号：O643[理学—物理化学]