Abstract
The most abundant natural zeolite, clinoptilolite, was leached with H 3PO 4 and then studied by X-ray fluorescence and diffraction, adsorption of NH 3, thermoprogrammed desorption of NH 3, 57Fe Moessbauer and Fourier transform infrared spectroscopies, and by 31P, 27Al and 29Si magic-angle spinning nuclear magnetic resonance. The material was purified, because 60% of Fe was extracted, and its crystallinity was preserved. The zeolite surface was covered by dilute short-chain polyphosphate species, containing tetrahedral P, octahedral Al and Ca. The Brønsted acidity was modified by dealumination and creation of POH groups.
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