Ammonia-based selective catalytic reduction (SCR) is essential for removing nitrogen oxides (

NOx) emitted from industrial

furnaces and automobiles. Although commercial V2O5/

TiO2 catalysts are economically viable for NH3-

SCR, their

poor catalytic activities limit their use to operating temperatures greater than 300 ℃, which prevents their use under lowtemperature

exhaust conditions. In this study, we employed a one-step sol–gel method to produce V2O5/

TiO2 catalysts and

then compared their catalytic performances and physicochemical characteristics with those of a conventional impregnated

V2O5/

TiO2 catalyst. This one-step approach resulted in catalysts that exhibited improved NO conversions; notably, the

activity of sol–gel catalysts produced under optimized conditions was almost twice that of the conventional catalyst. In this

study, catalyst calcination temperature was adjusted between 250 and 550 ℃. X-ray diffraction showed the crystallinity of

the anatase TiO2

phase increased with calcination temperature, but calcination temperatures (> 500 ℃) caused sintering and

reduced BET surface area as determined using N2

adsorption–desorption isotherms. X-ray photoelectron spectroscopy and

NH3

temperature-programmed desorption demonstrated that catalysts calcined at temperatures between 350 and 500 °C

had optimal amounts of V4+

species, surface oxygen, and acidic sites, which are essential for catalytic activity. This study

highlights that the one-step sol–gel technique provides a simple, cost-effective means of synthesizing high-performance

V2O5/

TiO2 catalysts for low-temperature NH3-

SCR applications.