Effect of Vanadium Structure and Lattice Oxygen in V-Based TiO₂ Catalysts on Selective Catalytic Reduction of NOx by NH₃

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  • Kwon Dong Wook
    Department of Environmental Energy Engineering, Graduate School of Kyonggi University
  • Park Kwang Hee
    Department of Development & Reseach Engineer, Alamtum Co., Ltd.
  • Hong Sung Chang
    Department of Development & Reseach Engineer, Alamtum Co., Ltd.

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タイトル別名
  • Effect of Vanadium Structure and Lattice Oxygen in V-Based TiO<sub>2</sub> Catalysts on Selective Catalytic Reduction of NO<sub><i>x</i></sub> by NH<sub>3</sub>

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In this study, the correlation between surface vanadium species and reactive lattice oxygen in the selective catalytic reduction of NOx by NH3 was investigated. The properties of the V/TiO2 catalysts were investigated using physicochemical measurements, including Brunauer–Emmett–Teller surface area, temperature programmed reduction with hydrogen, Raman spectroscopy, and UV–visible diffuse reflectance spectroscopy. V/TiO2 catalysts were prepared using the wet impregnation method by supporting 2 wt% vanadium on TiO2 thermally treated at various calcination temperatures. Lattice oxygen participating in the reaction was found to be most abundant in 2V/TiO2-600, prepared from TiO2 calcined at 600°C. An increase in reactive lattice oxygen, resulting from an increase in the proportion of polymeric distorted tetrahedral structure existing on the surface of the catalyst, improved the catalyst efficiency. A polymeric distorted tetrahedral structure is referred to as a bridged bond (V–O–V). In addition, greater SO2 resistance was related to a higher polymeric VOx ratio. Thus, the bridged bond (V–O–V) provides the lattice oxygen participating in the reaction.

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