Characterization of Synthetic Microporous Pillared Beidellites of High Thermal Stability

The clay mineral beidellite was synthesized and pillared, separately, with the three different tridecameric cations AlO4Al12(OH)24(H2O)12 7+, GaO4Al12(OH)24(H2O)12 7+, and GaO4Ga12(OH)24(H2O)12 7+. The basal spacings and surface areas of the resulting pillared clays were monitored as a function of t...

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Bibliographic Details
Published in:Chemistry of materials 1997-02, Vol.9 (2), p.567-572
Main Authors: Brandt, Kerstin B, Kydd, Ronald A
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Miscellaneous
Preparations and properties
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Summary:The clay mineral beidellite was synthesized and pillared, separately, with the three different tridecameric cations AlO4Al12(OH)24(H2O)12 7+, GaO4Al12(OH)24(H2O)12 7+, and GaO4Ga12(OH)24(H2O)12 7+. The basal spacings and surface areas of the resulting pillared clays were monitored as a function of temperature, and it was found that the beidellites were usually more thermally stable than the corresponding pillared montmorillonites. 27Al MAS NMR spectra were obtained in an effort to understand the structural changes taking place in the pillars and in the clay layers upon calcination; the signal from tetrahedral aluminum diminished considerably after calcination at 500 °C. The argon adsorption isotherms were measured, and the pillared clays were found to have a bimodal micropore size distribution, with maxima at 0.6 and 0.8 nm.
ISSN:0897-4756
1520-5002
DOI:10.1021/cm960403r