Selective catalytic reduction is widely applied to various industries for NO x removal. In this study, CeVO 4 -based catalysts 

were modifi ed with iron and cobalt to enhance catalytic activity. Each transition metal was partially substituted into either 

the Ce or V site at 0.2 molar ratio. The synthesized catalysts exhibited both partial incorporation of the transition metal 

into the CeVO4 lattice and the formation of secondary metal oxide phases. In particular, the V site substitution led to 

lattice expansion, CeO2 formation, and smaller particle sizes, while the Ce site substitution caused lattice contraction and 

larger particle sizes. All of the catalysts were coated on the alumina pellets to protect the reactor from increasing pressure 

during the catalytic reduction reaction and boost the catalytic activities, that were evaluated under both oxygen absence 

and 1 mol% oxygen fl ow conditions. Among them, CeVO4 -CeO2 -Co3V2 O 8 /Al2O3 catalyst (Ce:V:Co = 1:0.8:0.2 molar 

ratio) exhibited the highest NO conversion. This result was attributed to synergistic eff ects, including the promotional 

eff ect of CeO2 , and enhanced oxygen migration via the asymmetric Co3+ -O-V5+ phase. Therefore, the transition metal 

incorporation, particularly Co substitution at V sites, eff ectively enhances the catalytic activity of CeVO 4 -based catalysts 

in the NH 3 -SCR process.