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Monolayer transition metal supported on titania catalysts for the selective catalytic reduction of NO by NH3

Applied Catalysis B Environmental
Publication Date
DOI: 10.1016/j.apcatb.2004.04.001
  • V2O5/Tio2
  • Cr2O3/Tio2
  • Moo3/Tio2
  • Wo3/Tio2Monolayer Catalysts
  • Transition Metal Supported Titania Catalysts
  • Equilibrium Deposition Filtration (Edf)
  • Selective Catalytic Reduction (Scr)
  • Nitric Oxide
  • Ammonia
  • Active Phase–Support Interactions
  • Drs
  • Xps


Abstract Monolayer catalysts were prepared by supporting transition metal ionic (t.m.i.)-oxo species (VO x , CrO x , MoO x and WO x ) on the TiO 2 (anatase) surface using the equilibrium–deposition–filtration (EDF) technique. The prepared samples were characterized by N 2 adsorption, UV/Vis diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and tested for the selective catalytic reduction of NO by NH 3 (NH 3-SCR) in the temperature range 250–450 °C. Using the EDF method the transition metal ion (V, Cr, Mo or W) loading of the supported titania catalysts achieved at monolayer coverage follows the order V>Mo>W>Cr. It is mainly determined by the deposition of polymeric t.m.i.-oxo species on the surface of titania in the impregnation step. The activity of the corresponding monolayers follows the order V>Cr>Mo≥W. It was also demonstrated that the activity of the above catalysts correlates well with the intensity of a DRS absorption band appearing at ca. 400 nm. The intensity of this absorption band, which is considered as a measure of the extent of interactions exerted between the active phase and the support surface, depends on the kind and the amount of the transition metal.

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