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• W1974771427 abstract "Fe/ZSM-5 catalysts with high Fe loading (Fe/Al∼1) have been prepared by sublimation of FeCl3 onto H-ZSM-5 samples of different Si/Al ratios. They catalyze NOx reduction with hydrocarbons in an excess of O2 and H2O. TPR shows that the Fe in the zeolite cavities is different from Fe2O3 particles. Naked Fe3+ ions are absent; oxo-ions, which are equally well reducible by CO and H2, prevail. A minority of the Fe complexes lose oxygen upon mere heating to ∼500°C; some of the reduced sites are reoxidized only by N2O. The population of oxo-complexes that lose oxygen by heating depends on the Si/Al ratio, this dependence is in qualitative agreement with the model of (2+) charged binuclear ions [HO–Fe–O–Fe–OH]2+. Upon reacting with NO, the bridging O atom is transferred and NO2 is formed. This step is not rate limiting for active catalysts with high Al/Si ratio and high Fe loading, but it becomes critical with zeolites of low Al/Si ratio." @default.
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• W1974771427 date "1998-12-01" @default.
• W1974771427 modified "2023-10-16" @default.
• W1974771427 title "On the nature of active sites in Fe/ZSM-5 catalysts for NOx abatement" @default.
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• W1974771427 doi "https://doi.org/10.1016/s0926-3373(98)00082-4" @default.
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