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Bulk and surface properties of commercial kaolins
AbstractFour different commercial kaolins have been characterized by specific surface measurement, X-ray diffraction, transmission electron microscopy, SEM–EDX analysis, TGA measurements, DR–UV–Vis–NIR spectroscopy, transmission IR spectroscopy of the samples as such and after acetonitrile adsorption. A correlation between surface acidity and structural and chemical properties was attempted. Kaolinite surface was almost neutral, with a very small amount of medium acidic centers. These centers gave rise to a weak protonic acidity arising from bridging hydroxy-groups on exposed basal planes (exposed gibbsite-like layers), and silanol groups likely formed on non-basal planes, as well as medium strength Lewis acid sites likely exposed on non-basal planes. Lewis and Brønsted sites may also arise from mineral impurities (e.g. anatase, amorphous silica–alumina).
Bulk and surface properties of commercial kaolins
AbstractFour different commercial kaolins have been characterized by specific surface measurement, X-ray diffraction, transmission electron microscopy, SEM–EDX analysis, TGA measurements, DR–UV–Vis–NIR spectroscopy, transmission IR spectroscopy of the samples as such and after acetonitrile adsorption. A correlation between surface acidity and structural and chemical properties was attempted. Kaolinite surface was almost neutral, with a very small amount of medium acidic centers. These centers gave rise to a weak protonic acidity arising from bridging hydroxy-groups on exposed basal planes (exposed gibbsite-like layers), and silanol groups likely formed on non-basal planes, as well as medium strength Lewis acid sites likely exposed on non-basal planes. Lewis and Brønsted sites may also arise from mineral impurities (e.g. anatase, amorphous silica–alumina).
Bulk and surface properties of commercial kaolins
Castellano, Maila (author) / Turturro, Antonio (author) / Riani, Paola (author) / Montanari, Tania (author) / Finocchio, Elisabetta (author) / Ramis, Gianguido (author) / Busca, Guido (author)
Applied Clay Science ; 48 ; 446-454
2010-02-02
9 pages
Article (Journal)
Electronic Resource
English
Bulk and surface properties of commercial kaolins
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