Low-temperature selective catalytic reduction of NO x with NH3 over Fe–Cu mixed oxide/ZSM-5 catalysts containing Fe2CuO4 phase

Low-temperature selective catalytic reduction of NO x with NH3 over Fe–Cu mixed oxide/ZSM-5... Novel Fe–Cu mixed oxide/ZSM-5 catalysts were prepared for low-temperature selective catalytic reduction (SCR) of NO x with ammonia. Fe–CuO x /ZSM-5 catalysts showed higher activity than FeO x /ZSM-5 or CuO x /ZSM-5. The NO x conversion with Fe–CuO x /ZSM-5 was over 98 % within the temperature range from 180 to 400 °C. X-ray powder diffraction (XRD) results suggested that a new crystal phase of Fe2CuO4 appeared in the Fe–CuO x /ZSM-5 catalysts. NO-temperature programmed desorption (NO-TPD) showed that more NO was adsorbed onto the catalyst when the Fe2CuO4 phase appeared. Electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) results showed that Fe and Cu were present in different valence states in the catalysts. EPR results indicated that Cu2+ may be a product of a series of reactions which happened when NO and O2 were added into the Fe–CuO x /ZSM-5 catalyst. Intensive analysis of fresh and used catalysts by XPS revealed that electron transfer between Fe and Cu ions in Fe2CuO4 may play an important role in SCR of NO x with ammonia. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Low-temperature selective catalytic reduction of NO x with NH3 over Fe–Cu mixed oxide/ZSM-5 catalysts containing Fe2CuO4 phase

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Publisher
Springer Netherlands
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1580-2
Publisher site
See Article on Publisher Site

Abstract

Novel Fe–Cu mixed oxide/ZSM-5 catalysts were prepared for low-temperature selective catalytic reduction (SCR) of NO x with ammonia. Fe–CuO x /ZSM-5 catalysts showed higher activity than FeO x /ZSM-5 or CuO x /ZSM-5. The NO x conversion with Fe–CuO x /ZSM-5 was over 98 % within the temperature range from 180 to 400 °C. X-ray powder diffraction (XRD) results suggested that a new crystal phase of Fe2CuO4 appeared in the Fe–CuO x /ZSM-5 catalysts. NO-temperature programmed desorption (NO-TPD) showed that more NO was adsorbed onto the catalyst when the Fe2CuO4 phase appeared. Electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) results showed that Fe and Cu were present in different valence states in the catalysts. EPR results indicated that Cu2+ may be a product of a series of reactions which happened when NO and O2 were added into the Fe–CuO x /ZSM-5 catalyst. Intensive analysis of fresh and used catalysts by XPS revealed that electron transfer between Fe and Cu ions in Fe2CuO4 may play an important role in SCR of NO x with ammonia.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Mar 23, 2014

References

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