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http://dx.doi.org/10.4191/KCERS.2008.45.5.297

Characterization of Alumina Doped with Lanthanum and Pluronic P123 via Sol-Gel Process  

Jung, Mie-Won (Department of Chemistry, Sungshin Women's University)
Lee, Mi-Hoe (Department of Chemistry, Sungshin Women's University)
Publication Information
Journal of the Korean Ceramic Society / v.45, no.5, 2008 , pp. 297-302 More about this Journal
Abstract
To direct the evolution of nanostructure and immobilize ${\gamma}-Al_2O_3$ catalyst, nanocrystalline La-doped-$Al_2O_3$ powder were prepared by the sol-gel process with addition of an amphiphilic block copolymer template (pluronic P123: $(poly(ethyleneoxide)_{20}-poly(propyleneoxide)_{70}-poly(ethyleneoxide)_{20})$. The dried gel is amorphous, whereas heating at temperature above $700^{\circ}C$ leads to the formation of nanocrystalline ${\gamma}$ and ${\delta}-Al_2O_3$ and these two phases is kept until $1100^{\circ}C$. ${\alpha}-A1_2O_3 $starts to form at $1200^{\circ}C$ with $LaAl_{11}O_{18}$. The surface morphology and crystal structure has been observed by field emission scanning electron microscope (FE-SEM) and X-ray diffraction (XRD). Solid state $^{27}Al$ MAS NMR indicates two types of local environment, i.e. octahedral and tetrahedral sites. The surface area and pore size was compared among these powders using the BET nitrogen adsorption measurements.
Keywords
La-doped-$Al_2O_3$; Amphiphilic block copolymer$^{27}Al$ NMR;
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