Chapter 9: Reduction of Stored NOx with CO/H2 and Hydrocarbons: A Spatial Resolution Analysis

Jae Soon Choi; Josh A. Pihl; Todd J. Toops; William P. Partridge

doi:10.1039/9781788013239-00245

Chapter 9: Reduction of Stored NO_x with CO/H₂ and Hydrocarbons: A Spatial Resolution Analysis

Jae Soon Choi, Josh A. Pihl, Todd J. Toops, William P. Partridge

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

Abstract

Lean NO_x traps (LNT) are multi-function multi-component catalysts which operate in an integral and transient reactor mode to reduce NO_x in the exhaust from diesel or lean-burn gasoline engines. This chapter addresses the regeneration phase of the LNT operation, discussing various types of reductants and reactions involved. We describe how reductants of different reactivity influence catalyst functions, reactions, and overall regeneration efficiency. The presented examples highlight the importance of understanding the spatial and temporal development of key reactions and their interplay to rationalize the global performance of practical LNTs which are generally honeycomb-shaped ceramic monoliths. The emphasis is on explaining global NO_x removal performance (i.e., activity and selectivity) based on the insights gained through spatially resolved techniques, including initial distribution and redistribution of stored NO_x; oxygen storage and reduction; transformation of feed reductants; and formation and utilization of reduction intermediates. Pathways leading to N₂O and NH₃ byproduct formation as well as mitigation strategies are also discussed.

Original language	English
Title of host publication	Biocatalysis
Subtitle of host publication	An Industrial Perspective
Editors	Luca Lietti, Lidia Castoldi
Publisher	Royal Society of Chemistry
Pages	245-278
Number of pages	34
Edition	33
ISBN (Electronic)	9781782620907, 9781782626190, 9781782627265, 9781782628637
ISBN (Print)	9781782629191, 9781782629313, 9781788014625
DOIs	https://doi.org/10.1039/9781788013239-00245
State	Published - 2018

Publication series

Name	RSC Catalysis Series
Number	33
Volume	2018-January
ISSN (Print)	1757-6725
ISSN (Electronic)	1757-6733

Funding

†This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States 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).

Funders	Funder number
U.S. Department of Energy
Office of Energy Efficiency and Renewable Energy

Access to Document

10.1039/9781788013239-00245

Cite this

Choi, J. S., Pihl, J. A., Toops, T. J., & Partridge, W. P. (2018). Chapter 9: Reduction of Stored NO_x with CO/H₂ and Hydrocarbons: A Spatial Resolution Analysis. In L. Lietti, & L. Castoldi (Eds.), Biocatalysis: An Industrial Perspective (33 ed., pp. 245-278). (RSC Catalysis Series; Vol. 2018-January, No. 33). Royal Society of Chemistry. https://doi.org/10.1039/9781788013239-00245

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abstract = "Lean NOx traps (LNT) are multi-function multi-component catalysts which operate in an integral and transient reactor mode to reduce NOx in the exhaust from diesel or lean-burn gasoline engines. This chapter addresses the regeneration phase of the LNT operation, discussing various types of reductants and reactions involved. We describe how reductants of different reactivity influence catalyst functions, reactions, and overall regeneration efficiency. The presented examples highlight the importance of understanding the spatial and temporal development of key reactions and their interplay to rationalize the global performance of practical LNTs which are generally honeycomb-shaped ceramic monoliths. The emphasis is on explaining global NOx removal performance (i.e., activity and selectivity) based on the insights gained through spatially resolved techniques, including initial distribution and redistribution of stored NOx; oxygen storage and reduction; transformation of feed reductants; and formation and utilization of reduction intermediates. Pathways leading to N2O and NH3 byproduct formation as well as mitigation strategies are also discussed.",

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Chapter 9: Reduction of Stored NO_x with CO/H₂ and Hydrocarbons: A Spatial Resolution Analysis. / Choi, Jae Soon; Pihl, Josh A.; Toops, Todd J. et al.
Biocatalysis: An Industrial Perspective. ed. / Luca Lietti; Lidia Castoldi. 33. ed. Royal Society of Chemistry, 2018. p. 245-278 (RSC Catalysis Series; Vol. 2018-January, No. 33).

Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review

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