Superior thermal stability of Keggin-Al 30 pillared montmorillonite: A comparative study with Keggin-Al 13 pillared montmorillonite
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چکیده
منابع مشابه
Thermal Emission of Alkali Metal Ions from Al30-Pillared Montmorillonite Studied by Mass Spectrometric Method
The thermal emission of alkali metal ions from Al30-pillared montmorillonite in comparison with its natural form was studied by mass spectrometry in the temperature range 770-930 K. The measurements were carried out on a magnetic mass spectrometer MI-1201. For natural montmorillonite, the densities of the emission currents (j) decrease in the mass spectrum in the following sequence (T = 805 K, ...
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Al,Fe-pillared clay was synthesized from domestic clay from Bogovina according to a common procedure: grinding, sieving, Na exchange, pillaring, drying and calcination. Two synthesized samples differing only in calcining conditions were prepared. Phase composition and textural properties of the starting clay and synthesized pillared clays were characterized using X-ray diffraction and physisorp...
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Strontium adsorption was studied in an aluminum-pillared montmorillonite (PILC) carrying organic acid groups. The in situ dissociation of these groups increases the number of negative sites in the modified PILC, promoting thus the uptake of cations from an exchange solution. To investigate the role of solution pH and acid strength in cation uptake phenomena, base titrations were performed for P...
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A hybrid surfactant/polyoxometalate compound was synthesized by combining isopolytungstate anions with the cationic surfactant cetyltrimethylammonium bromide (CTA-Br) to produce a hierarchical compound that we identify as (CTA)7[H2W12O40]Cl·2H2O. At room temperature the compound consisted of hexagonally ordered sheets of Keggin ions, with an intervening gallery containing alkyl-chains of the or...
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ژورنال
عنوان ژورنال: Microporous and Mesoporous Materials
سال: 2018
ISSN: 1387-1811
DOI: 10.1016/j.micromeso.2018.02.007