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Received December 26, 2000
Accepted June 28, 2001
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The Preparation and Surface Characterization of Zirconia Polymorphs
Dept. of Chem. Eng., University of California, Berkeley, CA 94720, USA 1Dept.of Chem. Eng., Yonsei University, 134-1 Shinchon-dong, Deodaemun-gu, Seoul 120-749, Korea
inorgzeo@hanmail.net
Korean Journal of Chemical Engineering, November 2001, 18(6), 992-999(8), 10.1007/BF02705631
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Abstract
Zirconium hydroxides were obtained by precipitation of zirconium chloride with aqueous ammonia at constant pH followed by hydrothermal treatment The effect of thermal activation of the zirconium hydroxide on physical properties, and the effect of crystalline phase on the surface properties of zirconia were studied. The pressure during the hydrothermal treatment of zirconium hydroxide affected the surface area, particle growth, and phase transformation of the zirconia product. Hydrothermally treated zirconia under atmospheric pressure (LP) shows higher surface area than that under high pressure (HP) and untreated (UT). HP zirconia shows a mixture of tetragonal and monoclinic phase after hydrothermal treatment due to the higher solubility and reprecipitation rate, whereas LP sample shows a tetragonal crystal structure from 600 to 1,050 ℃. Monoclinic phase zirconia shows greater CO2 and NH3 surface adsorption than amorphous and tetragonal phase zirconia. This suggests that the crystal structure of zirconia strongly affects the amount and strength of the surface adsorption site.
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Klabunde KJ, Bedilo AF, Nanostruct. Mater., 8, 119 (1997)
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Mamott GT, Barnes P, Tarling SE, Jones SL, Norman CJ, J. Mater. Sci., 26, 4054 (1991)
Mercera PL, Ph.D. Dissertation, University of Twente (1991)
Moles P, Appl. Catal. A: Gen., 87, N2 (1992)
Morterra C, Cerrato G, Emanuel C, Bolis VJ, J. Catal., 142, 349 (1993)
Murase Y, Kato E, Nippon Kagaku Kaishi, 367 (1978)
Murase Y, Kato E, J. Am. Ceram. Soc., 66, 196 (1983)
Nishiwaki K, Kakuta N, Ueno A, Nakabayashi H, J. Catal., 118, 498 (1989)
Nakabayashi H, Chem. Lett., 11, 945 (1996)
Pajonk GM, Eltanany A, React. Kinet. Catal. Lett., 47, 167 (1992)
Suh DJ, Park TJ, Sonn JH, Han HY, Lim JC, Korean J. Chem. Eng., 17(1), 101 (2000)
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Tanabe K, Seiyamam T, Tueki K, "Metal Oxide and Binary Oxide," Kodansha Scientific, Tokyo, 119 (1978)
Torralvo MJ, Alario MA, Soria J, J. Catal., 86, 473 (1984)
Ward DA, Ko EI, Chem. Mater., 5, 956 (1993)
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