Understanding System- and Component-Level [N.sub.2]O Emissions from a Vanadium-Based Nonroad Diesel Aftertreatment System

Nitrous oxide ([N.sub.2]O), with a global warming potential (GWP) of 297 and an average atmospheric residence time of over 100 years, is an important greenhouse gas (GHG). In recognition of this, [N.sub.2]O emissions from on-highway medium- and heavy-duty diesel engines were recently regulated by th...

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Bibliographic Details
Published in:SAE International journal of engines 2017-10, Vol.10 (4)
Main Authors: Ottinger, Nathan, Schmidt, Niklas, Liu, Z. Gerald
Format: Article
Language:English
Subjects:
Air pollution
Combustion
Diesel engines
Diesel motor industry
Global warming
Global warming potential
Greenhouse gases
Nitrous oxide
Vanadium
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Summary:Nitrous oxide ([N.sub.2]O), with a global warming potential (GWP) of 297 and an average atmospheric residence time of over 100 years, is an important greenhouse gas (GHG). In recognition of this, [N.sub.2]O emissions from on-highway medium- and heavy-duty diesel engines were recently regulated by the US Environmental Protection Agency (EPA) and National Highway Traffic Safety Administration's (NHTSA) GHG Emission Standards. Unlike NO and N[O.sub.2], collectively referred to as N[O.sub.x], [N.sub.2]0 is not a major byproduct of diesel combustion. However, [N.sub.2]O can be formed as a result of unselective catalytic reactions in diesel aftertreatment systems, and the mitigation of this unintended [N.sub.2]O formation is a topic of active research. In this study, a nonroad Tier 4 Final/Stage IV engine was equipped with a vanadium-based selective catalytic reduction (SCR) aftertreatment system. Experiments were conducted over nonroad steady and both cold and hot transient cycles (NRSC and NRTC, respectively). Engine-based results show that [N.sub.2]O emissions for this nonroad engine and aftertreatment system are below the current 0.1 g/bhphr on-highway GHG standard. To better understand the processes which contribute to the system-level [N.sub.2]O emissions seen during engine testing, reactor-based experiments were conducted to elucidate the fundamental component-level mechanisms responsible for [N.sub.2]O formation. This study provides significant system- and component-level insights into the formation of [N.sub.2]O in diesel aftertreatment systems. CITATION: Ottinger, N, Schmidt, N, and Liu, Z., "Understanding System- and Component-Level [N.sub.2]0 Emissions from a Vanadium-Based Nonroad Diesel Aftertreatment System," SAE Int. J. Engines 10(4):2017, doi: 10.4271/2017-01-0987.
ISSN:1946-3936
DOI:10.4271/2017-01-0987