Formation of Phases and Porous System in the Product of Hydrothermal Treatment of χ-Al2O3
AbstractThe presence of χ-Al2O3 resulting from thermal decomposition gibbsite as part of alumina catalysts is unfavorable because of its acid characteristics. One of the available techniques of χ-Al2O3 removal is crystallization under hydrothermal conditions into boehmite, which is a main precursor of active γ-Al2O3. The influence of products of the hydrothermal treatment of χ-Al2O3 obtaining in result of thermal decomposition gibbsite under T = 150–200 °C, P = 0.5–1.5 MPa and pH = 4.0–9.2 were studied. The hydrothermal treatment products in these conditions are gibbsite and boehmite phases which are formed coincidently by parallel ways. In the alkaline medium at pH = 8.0–9.2 three-dimensional parallelepiped boehmite crystals with the edge length > 200 nm are formed, at pH = 4.0 two-dimensional rhombic-shaped plates with thickness 20–100 nm and with the edge length ~ 80–500 nm are formed. Crystallization of coarse boehmite particles promotes the formation of large and closed mesoporous. View Full-Text
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Egorova, S.R.; Mukhamed’yarova, A.N.; Nesterova, O.V.; Zhang, Y.; Skibina, J.D.; Lamberov, A.A. Formation of Phases and Porous System in the Product of Hydrothermal Treatment of χ-Al2O3. Coatings 2018, 8, 30.
Egorova SR, Mukhamed’yarova AN, Nesterova OV, Zhang Y, Skibina JD, Lamberov AA. Formation of Phases and Porous System in the Product of Hydrothermal Treatment of χ-Al2O3. Coatings. 2018; 8(1):30.Chicago/Turabian Style
Egorova, Svetlana R.; Mukhamed’yarova, Aliya N.; Nesterova, Oksana V.; Zhang, Yuqing; Skibina, Juliya D.; Lamberov, Alexander A. 2018. "Formation of Phases and Porous System in the Product of Hydrothermal Treatment of χ-Al2O3." Coatings 8, no. 1: 30.