Vanadia-chromia grafted on titania: Structural and catalytic properties in the selective catalytic reduction of NO by NH3

K. Köhler, J. Engweiler, A. Baiker

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3 Scopus citations

Abstract

Chromia-vanadia on titania catalysts were prepared by sequential and simultaneous chemical reaction (grafting) of alkoxide and amide precursors of the transition metals with hydroxyl groups of the surface of titania. Their structure and redox properties under mild conditions were investigated by temperature programmed reduction by hydrogen (TPR) and spectroscopic methods, including UV-VIS and EPR. The oxidation state of the grafted transition metals depended strongly on pre-treatment conditions. Catalysts derived by grafting both transition metals (CrO(x)-VO(x)/TiO2) as well as corresponding titania-supported single oxide catalysts, VO(x)/TiO2 and CrO(x)/TiO2, were investigated in the selective catalytic reduction of nitric oxide by ammonia. The catalytic properties of CrO(x)-VO(x)/TiO2 could be explained by the superimposed characteristic behaviours (activity, temperature range, selectivity) of the reference systems VO(x)/TiO2 and CrO(x)/TiO2. Neither catalytic nor spectroscopic investigations indicated any interaction between grafted VO(x) and CrO(x). (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)423-430
Number of pages8
JournalJournal of Molecular Catalysis A: Chemical
Volume162
Issue number1-2
StatePublished - 20 Nov 2000

Keywords

  • Grafting
  • Selective catalytic reduction of nitric oxide by ammonia
  • Vanadia-chromia/titania catalysts

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