CAJ | 학술논문

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。
채용용액공침정법합성료CoAl-HT화MgAl-HT수활석,재800℃하단소4h득도료고려화미려첨정석양화물분체。이용XRD、FT-IR화TG대수활석급기양화물분체적결구화열은정성능진행료표정분석。종XRD화FT-IR분석결과가지,소득산품위층판수활석물질,차결정성량호,종CoAl-HT화MgAl-HT결과대비가지,미려조합경용역형성수활석결구;유양화물분체적XRD분석결과가지,재800℃하량자도형성료첨정석결구,차고려양화분체첨정석무잡상,결정성경호;TG곡선정현료량개양품적수활석열학성능,통과대비가지,MgAl-HT재216화372℃하분해이CoAl-HT재197화243℃하분해설명MgAl-HT비CoAl-HT구유경호적열은정성능。
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.