Simultaneous removal of NOx and soot particulate from diesel exhaust by in-situ catalytic generation and utilisation of N2O

Davies, Catherine, Thompson, Kate, Cooper, Anna, Golunski, Stanislaw ORCID: https://orcid.org/0000-0001-7980-8624, Taylor, Stuart H ORCID: https://orcid.org/0000-0002-1933-4874, Bogarra Macias, Maria, Doustdar, Omid and Tsolakis, Athanasios 2018. Simultaneous removal of NOx and soot particulate from diesel exhaust by in-situ catalytic generation and utilisation of N2O. Applied Catalysis B: Environmental 239 , pp. 10-15. 10.1016/j.apcatb.2018.07.072

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Abstract

One of the outstanding challenges in diesel exhaust catalysis is to integrate oxidation chemistry, soot filtration and NOx reduction in a single aftertreatment unit, while avoiding the need for fuel injection to regenerate the filter. Here we show that destruction of trapped soot can be initiated catalytically at 200 °C when its oxidation is coupled with non-selective NOx reduction (using NH3 as reductant), which acts as an in-situ source of N2O. In laboratory tests over an extended temperature range (up to 800 °C), using supported silver as a catalyst for both non-selective NOx-reduction and soot oxidation, the conversion of immobilised soot to CO2 can be resolved into four consecutive steps as the temperature rises: catalysed oxidation by N2O; non-catalysed oxidation by NO2; catalysed oxidation by O2; non-catalysed oxidation by O2. Initial engine tests indicate that the critical first step (C + N2O) can be replicated in a diesel exhaust.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Cardiff Catalysis Institute (CCI) Chemistry
Publisher:	Elsevier
ISSN:	0926-3373
Funders:	EPSRC
Date of First Compliant Deposit:	31 July 2018
Date of Acceptance:	27 July 2018
Last Modified:	08 May 2023 22:06
URI:	https://orca.cardiff.ac.uk/id/eprint/113789

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