수화한 무정형 알루미나로부터 제조된 γ  -Alumina의 특성

김윤섭; 고형신; 서정권; 이정민; 하백현; Yun-Seop Kim; Hyeong-Sin Go; Jeong-Gwon Seo; Jeong-Min Lee; Baek-Hyeon Ha

Korean Journal of Materials Research, Vol.11, No.11, 978-985, November, 2001

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수화한 무정형 알루미나로부터 제조된 γ -Alumina의 특성

Characteristics of γ -Alumina Prepared from Rehydrated Amorphous Alumina

김윤섭^†, 고형신¹, 서정권 ², 이정민², 하백현 ¹

여수대학교 화학공학과
¹한양대학교 화학공학과
²한국화학연구소 화학공정연구센터

Yun-Seop Kim^†, Hyeong-Sin Go¹, Jeong-Gwon Seo², Jeong-Min Lee², and Baek-Hyeon Ha¹

Department of Chemical Engineering, Yosu National University, Yosu 550-749, Korea
¹Department of Chemical Engineering, Hanyang University, Seoul 133-791, Korea
²Applied Chemistry & Engineering Division, Korea Research Institute of Chemical Technology, Yusung P.O.Box 107, Taejeon 305-600, Korea

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The amorphous alumina was obtained by flash calcination of Bayer gibbsite[ Al(OH) 3 aluminum trihydroxide]. Rehydration and pore characteristics of r?A1 2 O 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 ? C for 7hr. The r-Al_{2O}_3 , obtained by calcination of the prepared pseudo-boehmite at 500 ? C for 2hrs, is characterized by the specific surface area of 265m 2 /g, total pore volume of 0.75cm 3 /g.

Keywords:gibbsite;pseudo-boehmite;flash calcination;hydration;γ - Alumina

[References]

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Patermarakis G, Pavlidou C, J. Catal., 147(1), 140 (1994)
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Wefers K, Misra C, 'Oxide and Hydroxides of Aluminum', ALCOA Research Laboratories, Technical Paper 19, rev., Pittsburgh, USA (1987) (1987)
Hart DL, Alumina Science and Technology Handbook Chemicals,The American Ceramic Society Inc, USA (1990) (1990)
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[Related Articles]

[1] Yanagida H, Yamaguchi G, Kubota J, J. Ceram. Assoc. Jap., 74, 371 (1966)

[2] Patermarakis G, Pavlidou C, J. Catal., 147(1), 140 (1994)

[3] Chem Z, Jin MC, Zhen C, Chen GH, J. Am. Ceram. Soc., 74, 1325 (1991)

[4] Cormack B, Freeman J, Sing S, J. Chem. Tech. Biotech., 30, 367 (1800)

[5] Baker B, Pearson R, J. Catalysis, 33, 265 (1974)

[6] Harris MR, Sing KS, J. Appl. Chem. Biotechnol., 8, 386 (1958)

[7] Bagwell RB, Messing GL, Key Engineering Materials, 115, 45 (1996)

[8] Jovanovic N, Novakovvic T, Janackovic J, TerleckiBaricevic A, J. Colloid and Interf. Sci., 150, 36 (1991)

[9] Jaworska-Galas Z, Janiak S, Mista W, Wrzyszcz J, Zawadzkl M, J. Mat. Sci, 28, 2075 (1993)

[10] Kim SY, Kim YS, J. Kor. Ceram. Soc., 32, 1055 (1995)

[11] Kim SY, Kim YS, J. Kor. Ceram. Soc., 33, 92 (1995)

[12] Wefers K, Misra C, 'Oxide and Hydroxides of Aluminum', ALCOA Research Laboratories, Technical Paper 19, rev., Pittsburgh, USA (1987) (1987)

[13] Hart DL, Alumina Science and Technology Handbook Chemicals,The American Ceramic Society Inc, USA (1990) (1990)

[14] Oberlander RK, Aluminas for Catalysts, Applied Industrial Catalysis, vol. 3, Chapter 4, Academy Press, Inc., USA (1990) (1990)

[15] Misra C, 'Aluminum Oxide (Hydrate)', 4th ed., 2, 317 (1992) (1992)

[16] Barrett EP, Joyner LG, Halenda PP, J. Am. Chem. Soc., 73, 373 (1951)