Novel Fe-Ce-Ti catalyst with remarkable performance for the selective catalytic reduction of NOx by NH3

An environmentally benign Fe-Ce-Ti mixed oxide catalyst, which was prepared via the hydrothermal method, has been investigated for the selective catalytic reduction of NOx with NH3 (NH3-SCR). It was found that the Fe-Ce-Ti catalyst exhibited excellent NH3-SCR activity, high N-2 selectivity and strong resistance against H2O and SO2 with a wide operation temperature window. XRD and Raman spectra suggest that the Fe-Ce-Ti catalyst has an amorphous structure. The co-presence of Fe and Ce induced the formation of a redox cycle (Ce4+ + Fe2+ <-> Ce3+ + Fe3+), which promotes the activation of NO and NH3. In situ DRIFTS studies demonstrate that the synergetic effect between Fe and Ce contributes to the formation of reactive intermediate species, thus leading to the high catalytic deNO(x) performance of the Fe-Ce-Ti mixed oxide catalyst.