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5 7 Fe Mossbauer spectroscopy was used to investigate the redox behavior of iron species in steam-treated FeZSM-5, a catalyst material with outstanding properties in benzene-to-phenol oxidation as well as nitrous oxide decomposition. It was found that Fe 3+ ions in isolated extraframework sites and in extremely small oxo-iron clusters are easily converted into Fe 2+ ...
Two isomorphously substituted iron ZSM-5 catalysts with different crystal sizes (2.5 and 0.4 μm) were prepared by hydrothermal synthesis. The samples with a Si/Al ratio of 32 and 34 contained 0.64 and 0.60 wt% of iron, respectively, and were activated by steam at 873 K. The zeolites were characterized by XRD, SEM, TEM, FT-IR, and UV–vis spectroscopy, and EPR. The preparation procedure is an efficient...
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