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Structural characterization of iron species in Fe-ZSM-5 catalysts and the elucidation of their role in the mechanism of NOx reactions ( Dissertationsschrift )

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The selective catalytic reduction of NOx by ammonia (NH3-SCR) has widely applied in the abatement of NOx. Fe-ZSM-5 is a potential catalyst, showing high performance in standard SCR (mainly NO) at > 400°C and in fast SCR (NO/NO2 = 1) at 250°C. The identification of the active species in Fe-ZSM-5 catalysts and reaction mechanism for SCR reactions were investigated by in situ and operando EPR, UV-Vis and FTIR spectroscopy. The spectroscopic studies demonstrate the role of NO2 to reoxidize isolated Fe(II) to the active Fe(III) at and sites, and attribute them the higher activity in fast SCR.

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