Synthesis and Characterization of Fe2+ Ion-Exchanged TiO2 Materials and Their Supported V2O5 Catalysts for a Great Depression of the Formation of N2O in the Selective Reduction of NO by NH3

Fe-exchanged TiO2 substances ("FeTn") were synthesized by subliming a solid mixture of a surface-hydroxylated TiO2 ("HT") with a salt of iron(II) chloride at 200-400 degrees C to utilize them as supports for dramatically decreasing the formation of N2O in the reduction of NO by NH3 over supported V2O5 catalysts. All the FeTns did not undergo the incorporation of Fe cations into the lattice of the HT, the structural transformation, or the formation of any oxygen-containing iron complexes. Unique bands near 2286 cm(-1) by eta(1)-N2O adsorbed on the FeTns disclosed the presence of the Fe as isolated Fe2+ cations, consistent with their Fe 2p(3/2) main and satellite structures. All FeTn-supported V2O5 systems exhibited a noticeable decrease in N2O production at temperatures >= 350 degrees C, by 70-80%, compared to that over an HT-supported V2O5. Thus, such FeTns bode well for use as supports of V2O5 in deNO(x) catalysis.