Abstract
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°C 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°C, the surface area of 0.3 and 1.5 mol% La modified aluminas were 82 m2 g-1, while that of pure alumina was 45 m2 g-1. Even at 1300°C, the surface area of 5 mol% La modified alumina maintained 24 m2/g. The solid state reaction of lanthanum oxide with alumina formed LaAlO3 nanoparticles in the secondary particles of alumina. At 1300°C, LaAl11O18 was formed by the reaction of LaAlO3 with Al2O3.
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