Significantly Enhanced Catalytic Performance of Fe2(SO4)3/CeO2 Catalyst for the Selective Catalytic Reduction of NOx by NH3

A series of Fe2(SO4)3/CeO2 composite oxide catalysts were fabricated for the selective catalytic reduction of NOx by NH3 (NH3–SCR). Compared with CeO2 and Fe2(SO4)3 catalysts, Fe2(SO4)3/CeO2 exhibited much higher activity and enhanced N2 selectivity. On the basis of the results of characterization, it can be seen that both the reducibility and the surface acidity of Fe2(SO4)3/CeO2 have been enhanced remarkably, which is ascribed to the synergetic effect among Fe, Ce, and SO42–. In-situ DRIFTS research demonstrated that over Fe2(SO4)3/CeO2, the generation of inactive nitrate was suppressed. Meanwhile, the adsorption and activation of NH3 was remarkably enhanced. Consequently, superior NH3–SCR catalytic performance was achieved over Fe2(SO4)3/CeO2 catalyst.