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.
Research on Chemical Intermediates – Springer Journals
Published: Mar 23, 2014
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