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IR spectroscopy using NO as a probe allows the speciation of Fe sites in a Fe-silicalite as a function of the treatment conditions. (a) IR spectra of NO adsorbed at room temperature as a function of the NO coverage (maximum coverage: full yellow; minimum coverage: dotted yellow) for a Fe-silicalite activated at 500 °C. (b) As in (a) for the same material activated at 700 °C. Spectra reproduced with permission from ref (173). Copyright 2002 Elsevier.
