Remarkable activity of Ag/Al2O3/cordierite catalysts in SCR of NO with ethanol and butanol - Sorbonne Université Access content directly
Journal Articles Applied Catalysis B: Environmental Year : 2013

Remarkable activity of Ag/Al2O3/cordierite catalysts in SCR of NO with ethanol and butanol

Abstract

Structured silver-alumina catalysts were prepared by the one-step deposition of Al2O3 directly on the surface of cordierite block matrices with subsequent incipient wetness impregnation of Al2O3/cordierite with an AgNO3 aqueous solution. The catalysts were characterized by BET, XRD, XPS and FTIR spectroscopy with CO and pyridine as molecule probe, diffuse reflectance UV-vis, TEM and SEM. The Ag/Al2O3/cordierite catalysts are highly active in SCR of NO with ethanol and butanol and very selective toward N2. The conversion of NO over 0.6%Ag/45%Al2O3/cordierite catalyst reaches the high values of 95-99% already at 250 ◦C and remains at this high level up to 430 ◦C. The optimal silver loading in the silver-alumina catalysts is differing for C2 and C4 alcohols. It is shown that the role of silver in the Ag/Al2O3/cordierite catalyst consists in the modification of both redox and acid-base properties of the catalyst surface. Isolated cations (Ag+) and/or silver nanoclusters (Agn +) contain adsorbed oxygen in quantities sufficient only for the partial oxidation of alcohols toward oxygenated compounds, which then reduce NO.

Domains

Catalysis

Dates and versions

hal-00911716 , version 1 (29-11-2013)

Identifiers

Cite

Pavlo Kyriienko, Nataliia Popovych, Sergiy Soloviev, Svitlana Orlyk, Stanislaw Dzwigaj. Remarkable activity of Ag/Al2O3/cordierite catalysts in SCR of NO with ethanol and butanol. Applied Catalysis B: Environmental, 2013, 140-141, pp.691-699. ⟨10.1016/j.apcatb.2013.04.067⟩. ⟨hal-00911716⟩
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