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Topics in Catalysis
Published in: Topics in Catalysis 1-8/2013

01-05-2013 | OriginalPaper

Diesel Soot Catalyzes the Selective Catalytic Reduction of NOx with NH3

Authors: Max Mehring, Martin Elsener, Oliver Kröcher

Published in: Topics in Catalysis | Issue 1-8/2013

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Abstract

The catalytic activity of soot samples for the selective catalytic reduction (SCR) of NOx with NH3 was investigated in dependence of the NO2, NO and NH3 concentration in the temperature range between 200 and 350 °C. The highest NOx reduction of up to 25 % was measured in the presence of both NO2 and NO at a GHSV of 35,000 h−1. Decreasing space velocities resulted in an increase of the SCR activity. In the absence of NO2, NOx reduction was not observed. Carbon oxidation and SCR reaction occurred in parallel due to the presence of NO2 and O2, but hardly influenced each other, which suggested that in the NOx reduction on soot most probably physisorbed species were involved. The observed stoichiometries indicated the action of the fast SCR reaction in the presence of NO and the NO 2 SCR reaction in the absence of NO, while the observed gas phase and surface species pointed at reaction steps similar to those on classical SCR catalysts.
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Metadata
Title
Diesel Soot Catalyzes the Selective Catalytic Reduction of NOx with NH3
Authors
Max Mehring
Martin Elsener
Oliver Kröcher
Publication date
01-05-2013
Publisher
Springer US
Published in
Topics in Catalysis / Issue 1-8/2013
Print ISSN: 1022-5528
Electronic ISSN: 1572-9028
DOI
https://doi.org/10.1007/s11244-013-9993-5

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