Mn/TiO2 and Mn–Fe/TiO2 catalysts synthesized by deposition precipitation—promising for selective catalytic reduction of NO with NH3 at low temperatures

Siva Sankar Reddy Putluru, Leonhard Schill, Anker Degn Jensen, Bernard Siret, Frank Tabaries, Rasmus Fehrmann

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Abstract

Mn/TiO2and Mn–Fe/TiO2catalysts have been prepared by impregnation (IMP) and deposition-precipitation (DP) techniques and characterized by N2 physisorption, XRPD, NH3-TPD, H2-TPR, XPS and TGA. 25 wt% Mn0.75Fe0.25Ti-DP catalyst, prepared by deposition precipitation with ammonium carbamate (AC) as a precipitating agent, showed superior low-temperature SCR (selective catalytic reduction) of NO with NH3. The superior catalytic activity of the 25 wt% Mn0.75Fe0.25Ti-DP catalyst is probably due to the presence of amorphous phases of manganese oxide, iron oxide, high surface area, high total acidity, acidstrength and ease of reduction of manganese oxide and iron oxide on TiO2in addition to formation of an SCR active MnOx phase with high content of chemisorbed oxygen (Oα). The optimum catalyst might beused as tail-end SCR catalysts in, e.g., biomass-fired power plants and waste incineration plants.
Original languageEnglish
JournalApplied Catalysis B: Environmental
Volume165
Pages (from-to)628-635
Number of pages8
ISSN0926-3373
DOIs
Publication statusPublished - 2015

Keywords

  • SCR of NO with NH3
  • Mn–Fe/TiO2
  • Deposition precipitation

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