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. 2023 Oct 26;123(21):12135–12169. doi: 10.1021/acs.chemrev.3c00372

Figure 9.

Figure 9

IR and Raman spectra of Fe-substituted zeolites permit the speciation of the Fe sites and tracing of their mobility. (a and b) IR and (c) Raman (λexc = 1064 nm) spectra of a Fe-silicalite dehydrated in vacuum at 400 °C after calcination at 500 or 700 °C. Reproduced with permission from ref (157). Copyright 1996 Elsevier. (d) Schematic representation of the main Fe species present in Fe-silicalite, depending on the activation conditions, and corresponding IR bands. Fe(III)IN and Fe(III)OUT refer to Fe(III) sites inside and outside the framework, respectively. (e) IR spectra of a Fe/ZSM-5 prepared by CVD before (full line) and after (dotted line) interaction with NO2. Spectra reproduced with permission from ref (161). Copyright 2008 Elsevier.