A series
of Fe2(SO4)3/CeO2 composite
oxide catalysts were fabricated for the selective
catalytic reduction of NO
x
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 SO4
2–. 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.