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| - Physicochemical characterization by XRF, XRD, EXAFS, UV-VIS, IR, Raman, EPR, solid state NMR, TPD-MS, nitrogen sorption and other methods shows that the vanadium, molybdenum and rhenium oxo species are attached to the zeolite framework through interactions between the metal precursors and the hydroxyl groups inside the supercages of zeolite hosts.
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