Mn/TiO sub(2) and Mn-Fe/TiO sub(2) catalysts synthesized by deposition precipitation-promising for selective catalytic reduction of NO with NH sub(3) at low temperatures

• Published in: Applied catalysis. B, Environmental Environmental, 2015-04, Vol.165, p.628-635
• Main Authors: Putluru, Siva Sankar Reddy, Schill, Leonhard, Jensen, Anker Degn, Siret, Bernard, Tabaries, Franck, Fehrmann, Rasmus
• Format: Article
• Language: English
• Subjects: Catalysis; Catalysts; Deposition; Iron oxides; Manganese; Manganese oxides; Phases; Selective catalytic reduction; Titanium dioxide
• ISSN: 0926-3373
• DOI: 10.1016/j.apcatb.2014.10.060

Mn/TiO sub(2) and Mn-Fe/TiO sub(2) catalysts have been prepared by impregnation (IMP) and deposition-precipitation (DP) techniques and characterized by N sub(2) physisorption, XRPD, NH sub(3)-TPD, H sub(2)-TPR, XPS and TGA. 25 wt% Mn sub(0.75)Fe sub(0.25)Ti-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 NH sub(3). The superior catalytic activity of the 25 wt% Mn sub(0.75)Fe sub(0.25)Ti-DP catalyst is probably due to the presence of amorphous phases of manganese oxide, iron oxide, high surface area, high total acidity, acid strength and ease of reduction of manganese oxide and iron oxide on TiO sub(2) in addition to formation of an SCR active MnO sub(x) phase with high content of chemisorbed oxygen (O sub( alpha )). The optimum catalyst might be used as tail-end SCR catalysts in, e.g., biomass-fired power plants and waste incineration plants.