La2O3-doped bulk alumina aerogel

La2O3 doped bulk alumina aerogels/Lanthanum oxide doped bulk alumina aerogels/La2O3-doped bulk Al2O3 aerogel/Lanthanum oxide doped bulk Al2O3 aerogels with different La2O3 contents are prepared by using aluminum tri-sec-butoxide as precursor via sol-gel route combined with acetone-aniline in situ water formation (ISWF) method, followed by supercritical fluid drying. The effect of La2O3 on microstructure and thermal stability of alumina aerogels is investigated by SEM, TEM, XRD and N2 adsorption. The results show that the morphology of alumina aerogels changes from sphere like accumulated to notably sheet like stacked with the doping of La2O3. An appropriate amount of La2O3 doping can enhance the specific surface area of alumina aerogels, and the 9 mol% La2O3 doping aerogels has the largest specific surface area. In addition, the alumina crystal growth and phase transition of the aerogels upon heat treatment are effectively inhibited by La2O3 doping, which significantly improves the thermal stability of the aerogels. After heat treatment at 1200℃ for 2h, the phase of 9 mol% La2O3 doped alumina aerogel remains in the θ-Al2O3 while that of undoped one is a-Al2O3, and the specific surface area of 9 mol% La2O3 doped alumina aerogel is 86.5 m2/g which is higher than the undoped one (46 m2/g).

msds of La2O3-doped bulk alumina aerogel