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17.07.2019 | Special Issue: 2018 CLEERS Workshop, September 18-20, Ann Arbor, Michigan, United States | Ausgabe 3/2019

Emission Control Science and Technology 3/2019

Passive SCR Performance Under Pseudo-Transient Cycle: Challenges and Opportunities for Meeting Tier 3 Emissions

Zeitschrift:
Emission Control Science and Technology > Ausgabe 3/2019
Autoren:
Vitaly Y. Prikhodko, Josh A. Pihl, Todd J. Toops, James E. Parks II
Wichtige Hinweise
This manuscript has been authored by UT-Battelle, LLC, under Contract No. DE-AC0500OR22725 with the US Department of Energy. The US Government retains and the publisher, by accepting the article for publication, acknowledges that the US Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for the US Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://​energy.​gov/​downloads/​doe-public-access-plan).

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Abstract

The passive ammonia (NH3) selective catalytic reduction (SCR) system is a potential approach for controlling nitrogen oxide (NOx) emissions from lean-burn gasoline engines based on utilizing NH3 generated by a three-way catalyst (TWC) during brief periods of fuel-rich engine operation. NH3 generated by the TWC is stored and available to reduce NOx on a downstream SCR catalyst during subsequent periods of lean engine operation. Control of the overall passive SCR process can be more challenging than current urea-based approach because it depends explicitly on fuel-rich engine operation, which must be implemented in the context of transient engine operation. Under transient engine operation, significant variation in SCR temperatures is also to be expected. With NH3 storage capacity highly dependent on exhaust temperatures, proper system architecture and engine operating strategy are needed for effective NH3 utilization over the SCR catalyst. In this study, the performance of a passive SCR system was evaluated on a 2.0-l BMW lean-burn gasoline direct injection engine under 6-mode pseudo-transient cycle. The aim of this work is to understand how various engine operating strategies change the dynamics of NH3 generation and utilization, and NOx reduction in the passive SCR system. A 5.9% fuel economy improvement relative to stoichiometric-only operation with 0.018 g/mi of NOx + NMHC emissions were demonstrated over 6-mode pseudo-transient cycle; however, CO emissions were twice the emission standard. The results of this work reveal challenges and opportunities for meeting Tier 3 emissions and improving fuel savings benefits.

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