Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Characteristics of $\gamma$-Alumina Prepared from Rehydrated Amorphous Alumina

수화한 무정형 알루미나로부터 제조된 $\gamma$-Alumina의 특성

  • Kim, Yun-Seop (Yosu National University) ;
  • Go, Hyeong-Sin (Department of Chemical Engineering, Hanyang University) ;
  • Seo, Jeong-Gwon (Chem. Process & Eng. center, Korea Rsesarch Institute of chemical Technology) ;
  • Lee, Jeong-Min (Chem. Process & Eng. center, Korea Rsesarch Institute of chemical Technology) ;
  • Ha, Baek-Hyeon (Department of Chemical Engineering, Hanyang University)
  • 김윤섭 (여수대학교 화학공학과) ;
  • 고형신 (한양대학교 화학공학과) ;
  • 서정권 (한국화학연구소 화학공정연구센터) ;
  • 이정민 (한국화학연구소 화학공정연구센터) ;
  • 하백현 (한양대학교 화학공학과)
  • Published : 2001.11.01
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Abstract

The amorphous alumina was obtained by flash calcination of Bayer gibbsite[$Al(OH)_3$aluminum trihydroxide]. Rehydration and pore characteristics of $r-A1_2O_3$ prepared from rehydrated amorphous alumina were investigated. Crystal phases of pseudo-boehmite and bayerite were changed when amorphous alumina was hydrated at various conditions such as time, the ratio of water/alumina and pH. Specific surface areas and pore volumes of $r- A1_{2O}_3$ were influenced by the reaction time, water/alumina and PH of rehydration. The total pore volume of $r-A1_{2O}_3$increases with increasing the reaction time and ratio of water/alumina. Especially, the pure pseudo-boehmite of single phase could be prepared, when amorphous alumina was hydrated in the range of pH 6.5-8.0 in water/alumina= 10 at $90^{\circ}C$ for 7hr. The $r-Al_{2O}_3$, obtained by calcination of the prepared pseudo-boehmite at $500^{\circ}C$ for 2hrs, is characterized by the specific surface area of $265m^2$/g, total pore volume of $0.75cm^3$/g.

Keywords

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