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<p>Ammonia-based selective catalytic reduction (SCR) is essential for removing nitrogen oxides (NO<sub>x</sub>) emitted from industrial furnaces and automobiles. Although commercial V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> catalysts are economically viable for NH<sub>3</sub>-SCR, their poor catalytic activities limit their use to operating temperatures greater than 300&#xa0;℃, which prevents their use under low-temperature exhaust conditions. In this study, we employed a one-step sol–gel method to produce V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> catalysts and then compared their catalytic performances and physicochemical characteristics with those of a conventional impregnated V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> 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&#xa0;℃. X-ray diffraction showed the crystallinity of the anatase TiO<sub>2</sub> phase increased with calcination temperature, but calcination temperatures (&gt; 500&#xa0;℃) caused sintering and reduced BET surface area as determined using N<sub>2</sub> adsorption–desorption isotherms. X-ray photoelectron spectroscopy and NH<sub>3</sub> temperature-programmed desorption demonstrated that catalysts calcined at temperatures between 350 and 500&#xa0;°C had optimal amounts of V<sup>4+</sup> 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 V<sub>2</sub>O<sub>5</sub>/TiO<sub>2</sub> catalysts for low-temperature NH<sub>3</sub>-SCR applications.</p>

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Sol–Gel Synthesized V2O5/TiO2 Catalysts for NH3-SCR: Effect of Calcination Temperature on Performance

  • 期刊论文

  • 发表日期：

    2025年7月8日

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  • Se-Jun Kwon,
  • Junyoung Lee,
  • Byung Chan Kwon,
  • Dohyung Kang,
  • No-Kuk Park

摘要

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 low-temperature 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.