The conventional V2O5–WO3/TiO2 catalyst suffers severely from arsenic poisoning,
leading to a significant loss of catalytic activity. The doping of
Al or Mo plays an important role in promoting the arsenic resistance
on NH3 selective catalytic reduction (NH3-SCR),
but their promotion mechanism remains in debate and has yet to be
explored in multipollutant control (MPC) of NO
x
and chlorinated organics. Herein, our experimental characterizations
and density functional theory (DFT) calculations confirmed that arsenic
species preferentially adsorb on both Al and Mo to form arsenate,
thereby avoiding bonding to the catalytically active V sites. More
importantly, Al doping partially converted the polymeric vanadyl species
into monomeric ones, thereby inhibiting the near-surface and bulk
lattice oxygen mobility of the V2O5–WO3/TiO2 catalyst, while Mo doping resulted in vanadyl
polymerization with an enriched V5+ chemical state and
exhibited superior MPC activity and CO
x
selectivity. Our work shows that antipoisoning catalysts can be
designed with the combination of site protection and occurrence state
modification of the active species.
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