Influence of kaolinite crystalline structure in the production of γ-Al2O3 by alkaline lixiviation

The main uses of gamma-Al2O3 of high surface and thermal stability, as catalyst support, has originated several production methods such as the selective dissolution of siliceous components of kaolinite thermally amorphised. A high degree of crystallinity of the raw kaolinite thermally treated betwee...

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Bibliographic Details
Published in:Materials letters 2003, Vol.57 (5-6), p.1167-1170
Main Authors: TORRES SANCHEZ, R. M, PEREZ DE VARGAS, S. L, SOTO, E, BASALDELLA, E. I
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:The main uses of gamma-Al2O3 of high surface and thermal stability, as catalyst support, has originated several production methods such as the selective dissolution of siliceous components of kaolinite thermally amorphised. A high degree of crystallinity of the raw kaolinite thermally treated between 750 and 1100 C allows gamma-Al2O3 to be obtained with the desired characteristics whatever the alkali concentration used. The specific surface area of gamma-Al2O3 obtained seems to be related to the alkali concentration utilised. A further calcination at 1250 C generates alpha-Al2O3 of high surface area and crystallinity. 9 refs.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(02)00950-3