Tandem catalysis is widely adopted for multipollutant
control in
mobile sources but has rarely been reported in stationary source emission
elimination. This work proposed a tandem arrangement way with up-streamed
V2O5/TiO2 + down-streamed Cr2O3/TiO2 catalysts, which could achieve
the efficient synergistic control of NO
x
and C3H8 in industrial flue gas. Moreover,
this arrangement successfully alleviated the unwanted N2O formation during the NH3 -SCR process. Compared to the
conventional impregnation method of the Cr2O3–V2O5/TiO2 catalyst, the
tandem catalysts of V2O5/TiO2 + Cr2O3/TiO2 could enhance the NO
x
and C3H8 conversion by 4.2%
and 39.5%, respectively, at 350 °C. It might be attributed to
the fact that Cr species was the active site for C3H8 oxidation, and the tandem arrangement of catalysts was beneficial
to even dispersion of active components on supports. Furthermore,
due to the preferential NO
x
removal over
the up-streamed V2O5/TiO2 catalyst,
the tandem catalysts obviously alleviated the N2O formation
caused by Cr species during the NH3-SCR process. Herein,
it significantly decreased N2O formation by 240.5% at 350
°C compared to the Cr2O3–V2O5/TiO2 catalyst, achieving multipollutant
emission control from industrial flue gas with the performance of
“one stone three birds”.