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A Comparison of Structural Characterization of Composite Alumina Powder Prepared by Sol-Gel Method According to the Promoters  

Lee, Jung-Woon (Department of Chemical Engineering, Sogang University)
Yoon, Ho-Sung (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Chae, U-Suk (Department of Chemical Engineering, Sogang University)
Park, Han-Jin (Department of Chemical Engineering, Sogang University)
Hwang, Un-Yeon (Department of Chemical Engineering, Sogang University)
Park, Hyung-Sang (Department of Chemical Engineering, Sogang University)
Park, Dal-Ryung (LNG Technology Research Center, KOGAS)
Yoo, Seung-Joon (Faculty of Environmental and Chemical Engineering, Seonam University)
Publication Information
Korean Chemical Engineering Research / v.43, no.4, 2005 , pp. 503-510 More about this Journal
Abstract
In this research, composite alumina was prepared to add the various promoters by sol-gel method and examined its thermal stability. After sintering at $1,200^{\circ}C$, the thermal stability resulted in following order, $Si{\fallingdotseq}La$ > Ti > $Ba{\fallingdotseq}Ce$ > Y > $Zr{\fallingdotseq}Mg$, in accordance with adding the promoters. Especially in case of silica-added alumina, a phase transformation temperature to ${\alpha}$-alumina increased about $150^{\circ}C$ and after sintering at $1,200^{\circ}C$, it showed to maintain in ${\gamma}$-form and ${\delta}$-form alumina phase. Also it showed an increase of surface area from $3m^2/g$ to $71m^2/g$ compared with pure ${\alpha}$-alumina. In the case of silicaadded alumina, the characterization change of this alumina particle resulted in a delay of phase transformation because Si-O-Al bond was increased when sintered at high temperature. In case of lanthanum-added alumina, there was a sintering delay phenomenon in inter-particles as $LaAlO_3$ structure existed. The existence of lanthanum structure was confirmed by XRD and XPS analysis. It appeared on the alumina surface as $La_2O_3$ structure when it was sintered under $1,000^{\circ}C$, as the perovskite structure of $LaAlO_3$ at above $1,000^{\circ}C$ and as the magneto-plumbite structure of $LaAl_{11}O_{18}$ at above $1,300^{\circ}C$.
Keywords
Composite Alumina; Thermal Stability; Silica; Lanthanum; Sol-Gel;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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