ランタンを修飾したアルミナ触媒坦体の耐熱性と微細構造変化(<特集>希土類系物質の精密合成,形態制御および機能物性)

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We investigated the thermal stability and microstructural changes of lanthanum modified γ-alumina prepared by impregnation process, using aqueous lanthanum (III) nitrate. 0.1-10 mol% La added aluminas were heated in the temperature range of 600-1400℃ and characterized by surface area measurement, X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), differential thermal analysis (DTA), scanning electron microscope (SEM), and transmission electron microscope (TEM). At 1200℃, the surface area of 0.3 and 1.5 mol% La modified aluminas were 82 m^2 g^<-1>, while that of pure alumina was 45 m^2 g^<-1>. Even at 1300℃, the surface area of 5 mol% La modified alumina maintained 24 m^2/g. The solid state reaction of lanthanum oxide with alumina formed LaAlO_3 nanoparticles in the secondary particles of alumina. At 1300℃, LaAl_<11>O_<18> was formed by the reaction of LaAlO_3 with Al_2O_3.
社団法人日本セラミックス協会の論文
2007-10-01