Abstract
Thermodynamic analysis of phase equilibria in the Al2O3-H2O system at temperatures from 120 to 380°C and pressures from 1 to 70 MPa is carried out, and the dehydration of aluminum hydroxide under hydrothermal conditions is studied experimentally. The results indicate that γ-AlOOH (boehmite), which commonly appears in experimental phase diagrams, is a nonequilibrium phase in these temperature and pressure ranges. The dehydration rate and mechanism are shown to strongly depend on the crystallinity of the parent aluminum hydroxide and the pressure in the hydrothermal system.
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REFERENCES
Kazakov, S.V., Sokolov, A.N., Tsiporina, S.Z., et al., Aluminum Oxide with Mullite Structure, Izv. Akad. Nauk SSSR, Neorg. Mater., 1988, vol. 24, no.12, pp. 2010–2013.
Kiselev, V.F. and Krylov, O.V., Adsorbtsionnye protsessy na poverkhnosti poluprovodnikov i dielektrikov (Adsorption Processes on Semiconductor and Dielectric Surfaces), Moscow: Nauka, 1978.
Dzis’ko, V.A., Karnaukhov, A.P., and Tarasova, D.V., Fiziko-khimicheskie osnovy sinteza okisnykh katalizatorov (Physicochemical Principles behind the Synthesis of Oxide Catalysts), Novosibirsk: Nauka, 1978.
Kiselev, A.V. and Lygin, V.I., Infrakrasnye spektry poverkhnostnykh soedinenii (Infrared Spectra of Surface Species), Moscow: Nauka, 1972.
Lippens, B.C. and Steggerda, I.I., Active Alumina, Physical and Chemical Aspects of Adsorbents and Catalysts, Linsen, B.G., Ed., London: Academic, 1970. Translated under the title Stroenie i svoistva adsorbentov i katalizatorov, Moscow: Mir, 1973, pp. 190–230.
Chukin, G.D. and Seleznev, Yu.L., Mechanism of the Thermal Decomposition of Boehmite and a Structural Model of Aluminum Oxide, Kinet. Katal., 1989, vol. 30, no.1, pp. 69–77.
Mardilovich, P.P., Trokhimets, A.I., Zaretskii, M.V., and Kupchenko, G.G., IR Spectroscopic Study of Bayerite and Hydrargillite Dehydration, Zh. Prikl. Spektrosk., 1985, vol. 42, no.6, pp. 959–966.
Catalyst Supports and Supported Catalysts: Theoretical and Applied Concepts, Stiles, A.B., Ed., Boston: Butterworths, 1988. Translated under the title Nositeli i nanesennye katalizatory. Teoriya i praktika, Moscow: Khimiya, 1991.
Kalinina, A.M., On the Polymorphism and Thermal Transformation of Aluminum Oxide, Zh. Neorg. Khim., 1959, vol. 4, no.6, pp. 1261–1269.
Rubinshtein, A.M., Slovetskaya, K.I., Akimov, V.M., et al., Polymorphism and Catalytic Performance of Al2O3, Izv. Akad. Nauk SSSR, Ser. Khim., 1960, no. 1, pp. 31–37.
Sasvari, K. and Zalai, A., The Crystal Structure and Thermal Decomposition of Alumina Hydrates as Regarded from the Point of View of Lattice Geometry, Acta Geol. Hung., 1957, vol. 4, pp. 415–465.
Dzis’ko, V.A. and Ivanova, A.S., Basic Processes for the Preparation of Active Alumina, Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Khim. Nauk, 1985, vol. 15, no.5, pp. 110–119.
Krivoruchko, O.P., Buyanov, R.A., Fedotov, M.A., and Plyasova, M.N., Formation Mechanisms of Bayerite and Pseudoboehmite, Zh. Neorg. Khim., 1978, vol. 23, no.7, pp. 1796–1803.
Shkrabina, R.A., Moroz, E.M., and Levitskii, E.A., Polymorphous Transformations of Aluminum Oxides and Hydroxides, Kinet. Katal., 1981, vol. 22, no.5, pp. 1293–1299.
Yanagida, H. and Yamaguchi, G., Thermal Effect on the Lattices of γ-and η-Aluminium Oxide, Bull. Chem. Soc. Jpn., 1964, vol. 37, no.8, pp. 1229–1230.
Lippens, B.C. and De Boer, J.H., Study of Phase Transformations during Calcinations of Aluminium Hydroxides by Selected Area Electron Diffraction, Acta Crystallogr., 1964, vol. 17, pp. 1312–1321.
Saalfeld, H., Structure Phases of Dehydrated Gibbsite, React. Solids, 1961, pp. 310–316.
Ryabov, N.A., Kozhina, I.I., and Kozlov, I.L., Effect of Preparation Conditions on the Polymorphic Transformations of Aluminum Oxide, Zh. Neorg. Khim., 1970, vol. 15, no.3, pp. 602–606.
Levin, I. and Brandon, D., Metastable Alumina Polymorphs: Crystal Structures and Transition Sequences, J. Am. Ceram. Soc., 1998, vol. 81, no.8, pp. 1995–2012.
Sharma, P.K., Jilavi, M.H., Bugard, D., et al., Hydrothermal Synthesis of Nanosize α-Al2O3 from Seeded Aluminum Hydroxide, J. Am. Ceram. Soc., 1998, vol. 81, no.10, pp. 2732–2734.
Toropov, N.A., Barzakovskii, V.P., Lapin, V.V., and Kurtseva, N.N., Diagrammy sostoyaniya silikatnykh sistem: Spravochnik (Phase Diagrams of Silicate Systems: A Handbook), Leningrad: Nauka, 1965, issue 1, p. 546.
Laubengayer, A.W. and Weiss, R.S., J. Am. Chem. Soc., 1943, vol. 65, no.2, p. 250.
Erwin, G. and Osborn, E.F., J. Geol., 1951, vol. 59, no.4, p. 381.
Buerger, M.J., Polymorphism and Phase Transformation, Fortschr. Miner., 1961, vol. 39, pp. 9–24.
Pozhidaeva, O.V., Korytkova, E.N., Drozdova, I.A., and Gusarov, V.V., Effect of Hydrothermal Synthesis Conditions on the Phase State and Particle Size Ultrafine Zirconia, Zh. Obshch. Khim., 1999, vol. 69, no.8, pp. 1265–1270.
Pozhidaeva, O.V., Korytkova, E.N., Romanov, D.P., and Gusarov, V.V., Formation of Zirconia Nanocrystals in Various Hydrothermal Systems, Zh. Obshch. Khim., 2002, vol. 72, no.6, pp. 910–914.
Shigeyuki Somiya and Tokuji Akiba, Hydrothermal Zirconia Powders: A Bibliography, J. Eur. Ceram. Soc., 1999, no. 19, pp. 81–87.
Burukhin, A.A., Oleinikov, N.N., Churagulov, B.R., et al., Synthesis of Nanocrystalline Zirconia in Hydrothermal and Supercritical Solutions, Vestn. Voronezh. Gos. Tekh. Univ., Ser. Materialoved., 1999, issue 1.5, pp. 19–24.
Avvakumov, E.G., Mekhanicheskie metody aktivatsii khimicheskikh protsessov (Mechanical Activation of Chemical Processes), Novosibirsk: Nauka, 1986.
Mekhanokhimicheskii sintez v neorganicheskoi khimii (Mechanochemical Synthesis in Inorganic Chemistry), Novosibirsk: Nauka, 1991.
Grigor’eva, T.F., Vorsina, I.A., Barinova, A.P., and Lyakhov, N.Z., Early Stages in Mechanochemical Activation of Kaolinite and Talc, Neorg. Mater., 1996, vol. 32, no.1, pp. 84–89 [Inorg. Mater. (Engl. Transl.), vol. 32, no. 1, pp. 75–79].
Danchevskaya, M.N., Ivakin, Yu.D., Murav’eva, G.P., and Zui, A.I., Transformation of Mechanically Activated Hydrargillite Exposed to High Temperatures and Water Vapor, Vestn. Mosk. Univ., Ser. 2: Khim., 1997, vol. 38, no.1, pp. 21–25.
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Translated from Neorganicheskie Materialy, Vol. 41, No. 5, 2005, pp. 540–547.
Original Russian Text Copyright © 2005 by Al’myasheva, Korytkova, Maslov, Gusarov.
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Al’myasheva, O.V., Korytkova, E.N., Maslov, A.V. et al. Preparation of Nanocrystalline Alumina under Hydrothermal Conditions. Inorg Mater 41, 460–467 (2005). https://doi.org/10.1007/s10789-005-0152-7
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DOI: https://doi.org/10.1007/s10789-005-0152-7