期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 140, 期 -, 页码 691-699出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2013.04.067
关键词
Silver-alumina; Cordierite; SCR of NO; Ethanol, Butanol
资金
- National Academy of Sciences of Ukraine
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 N-2. The conversion of NO over 0.6%Ag/45%Al2O3/cordierite catalyst reaches the high values of 95-99% already at 250 degrees C and remains at this high level up to 430 degrees C. The optimal silver loading in the silver-alumina catalysts is differing for C-2 and C-4 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 (Ag-n(delta+)) contain adsorbed oxygen in quantities sufficient only for the partial oxidation of alcohols toward oxygenated compounds, which then reduce NO. (C) 2013 Elsevier B.V. All rights reserved.
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