Hydrothermal synthesis of porous zircon in basic fluorinated medium

The hydrothermal synthesis of zircon was performed under autogenous pressure, from inorganic precursors in aqueous fluorinated basic medium. The powders obtained were characterized by an abnormal broadness of all XRD peaks except for the (200) and (220) peaks. Their morphology was strongly dependent...

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Bibliographic Details
Published in:Microporous and mesoporous materials 1999-07, Vol.29 (3), p.311-318
Main Authors: Valéro, Rémi, Durand, Bernard, Guth, Jean-Louis, Chopin, Thierry
Format: Article
Language:English
Subjects:
Basic fluorinated synthesis gel
Chemistry
Colloidal state and disperse state
Ellipsoidal agglomerates
Exact sciences and technology
General and physical chemistry
High specific surface area
Hydrothermal synthesis
Porous materials
Porous zircon
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Summary:The hydrothermal synthesis of zircon was performed under autogenous pressure, from inorganic precursors in aqueous fluorinated basic medium. The powders obtained were characterized by an abnormal broadness of all XRD peaks except for the (200) and (220) peaks. Their morphology was strongly dependent upon the concentration [F −] of fluoride ions in the synthesis gel. At high [F −], ellipsoidal agglomerates were produced; the powders exhibited a specific surface area of about 200 m 2 g −1; the frame of the agglomerates was not destroyed by annealing at 800°C for 72 h, and 50% of the surface area was maintained. At low [F −], layered platelets were formed.
ISSN:1387-1811
1873-3093
DOI:10.1016/S1387-1811(98)00344-8