Simultaneous Selective Catalytic Reduction of NO and N2O by NH3 over Fe-Zeolite Catalysts

A series of Fe-beta, Fe-ZSM-5, and Fe-SAPO-34 catalysts were designed and prepared for the simultaneous selective catalytic reduction of NO and N2O with NH3 (SCR-sim). At 400 °C, the simultaneous conversions of NO and N2O were higher than 90% over the Fe-beta catalyst. The Fe-beta catalyst exhibited over 90% NO conversion in the selective catalytic reduction (SCR) of NO at 200 °C and 90% N2O conversion in the SCR of N2O at 350 °C. Ultraviolet−visible diffuse reflection (UV−vis DR) spectroscopy and temperature-programmed reduction of H2 (H2-TPR) results suggested that the isolated Fe(III) accounting for the primary Fe species in Fe-beta exhibited the best reductive ability in comparison to Fe-ZSM-5 and Fe-SAPO-34 catalysts. The high SCR-sim activity for the Fe-beta catalyst might also be associated with NO oxidation and NOx adsorption performance. The superior activity for the Fe-beta catalyst makes it a promising catalyst candidate for the industrial application of the simultaneous abatement of NO and N2O emission.