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Frontiers of Chemical Science and Engineering

2020, Volume 14,  Issue 4, Pages 471-491
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    Selective catalytic reduction of NO

    L.V. Pisarzhevskii Institute of Physical Chemistry of the NAS of Ukraine, Kyiv 03028, Ukraine

    Accepted: 2019-11-29 Available online:2019-11-29
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    10.1007/s11705-019-1847-7
    Cite this article
    Pavlo I. Kyriienko.Selective catalytic reduction of NO[J].Frontiers of Chemical Science and Engineering,2020,14(4):471-491.

    Abstract

    Research results regarding selective catalytic reduction (SCR) of NO with ethanol and other C oxygenates as reductants over silver-alumina catalysts are summarized. The aspects of the process mechanism, nature of active sites, role of alumina and silver (especially in the formation of bifunctional active sites), effects of reductants and reaction conditions are discussed. It has been determined that key stages of the process include formation of reactive enolic species, their interaction with NO and formation of nitroorganic compounds which transform to NCO species and further to N . The results obtained over various silver-alumina catalysts demonstrate the perspectives of their application for reducing the level of nitrogen oxides in engine emissions, including in the presence of water vapor and sulfur oxides. Ways to improve the catalysts for the SCR of NO with C oxygenates are outlined.

    Keywords

    SCR ; nitrogen oxides ; silver-alumina catalyst ; silver species ; ethanol ; oxygenates
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