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Formation of phases and porous system in the product of hydrothermal treatment of χ-Al<inf>2</inf>O<inf>3</inf>

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dc.date.accessioned 2019-01-22T20:54:42Z
dc.date.available 2019-01-22T20:54:42Z
dc.date.issued 2018
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/149381
dc.description.abstract © 2018 by the authors. The presence of χ-Al2O3resulting from thermal decomposition gibbsite as part of alumina catalysts is unfavorable because of its acid characteristics. One of the available techniques of χ-Al2O3removal 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-Al2O3obtaining 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.
dc.subject Alumina
dc.subject Boehmite
dc.subject Gibbsite
dc.subject Hydrothermal treatment
dc.title Formation of phases and porous system in the product of hydrothermal treatment of χ-Al<inf>2</inf>O<inf>3</inf>
dc.type Article
dc.relation.ispartofseries-issue 1
dc.relation.ispartofseries-volume 8
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS-2018-8-1-SID85051593869


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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