The effects of ceria loading on three-way catalysts for passive SCR operation

The effects of ceria loading on three-way catalysts for passive SCR operation

Passive SCR systems, which employ both a three-way catalyst and SCR catalyst, are effective for the reduction of nitrogen oxide (NOx) emissions from lean burn gasoline engines. However, questions remain regarding the effect of three-way catalyst formulations on their performance in these systems. He...

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Main Authors: Calvin R. Thomas, Josh A. Pihl, Vitaly Y. Prikhodko, Michelle K. Kidder, Jochen A. Lauterbach, Todd J. Toops
Format: Article
Language:English
Published: Elsevier 2021-08-01
Series:Catalysis Communications
Online Access:http://www.sciencedirect.com/science/article/pii/S1566736721000315
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spelling doaj-72bebabb52d34d9db8a96e314a7b82052021-05-16T04:22:39ZengElsevierCatalysis Communications1873-39052021-08-01156106308The effects of ceria loading on three-way catalysts for passive SCR operationCalvin R. Thomas0Josh A. Pihl1Vitaly Y. Prikhodko2Michelle K. Kidder3Jochen A. Lauterbach4Todd J. Toops5Oak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, United States of AmericaOak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, United States of AmericaOak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, United States of AmericaOak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, United States of AmericaUniversity of South Carolina, Columbia, SC 29208, United States of AmericaOak Ridge National Laboratory, 1 Bethel Valley Rd, Oak Ridge, TN 37830, United States of America; Corresponding author.Passive SCR systems, which employ both a three-way catalyst and SCR catalyst, are effective for the reduction of nitrogen oxide (NOx) emissions from lean burn gasoline engines. However, questions remain regarding the effect of three-way catalyst formulations on their performance in these systems. Here, Pd/CeOx/Al2O3 catalysts with variable CeOx loading were synthesized, characterized, and evaluated to determine the effects of CeOx on catalyst performance. While a small amount of ceria was beneficial for promoting essential reactions, excess ceria was detrimental due to the increase in oxygen storage capacity. Additionally, insights into potential reaction pathways for NH3 production were determined.http://www.sciencedirect.com/science/article/pii/S1566736721000315
collection DOAJ
language English
format Article
sources DOAJ
author Calvin R. Thomas
Josh A. Pihl
Vitaly Y. Prikhodko
Michelle K. Kidder
Jochen A. Lauterbach
Todd J. Toops
spellingShingle Calvin R. Thomas
Josh A. Pihl
Vitaly Y. Prikhodko
Michelle K. Kidder
Jochen A. Lauterbach
Todd J. Toops
The effects of ceria loading on three-way catalysts for passive SCR operation
Catalysis Communications
author_facet Calvin R. Thomas
Josh A. Pihl
Vitaly Y. Prikhodko
Michelle K. Kidder
Jochen A. Lauterbach
Todd J. Toops
author_sort Calvin R. Thomas
title The effects of ceria loading on three-way catalysts for passive SCR operation
title_short The effects of ceria loading on three-way catalysts for passive SCR operation
title_full The effects of ceria loading on three-way catalysts for passive SCR operation
title_fullStr The effects of ceria loading on three-way catalysts for passive SCR operation
title_full_unstemmed The effects of ceria loading on three-way catalysts for passive SCR operation
title_sort effects of ceria loading on three-way catalysts for passive scr operation
publisher Elsevier
series Catalysis Communications
issn 1873-3905
publishDate 2021-08-01
description Passive SCR systems, which employ both a three-way catalyst and SCR catalyst, are effective for the reduction of nitrogen oxide (NOx) emissions from lean burn gasoline engines. However, questions remain regarding the effect of three-way catalyst formulations on their performance in these systems. Here, Pd/CeOx/Al2O3 catalysts with variable CeOx loading were synthesized, characterized, and evaluated to determine the effects of CeOx on catalyst performance. While a small amount of ceria was beneficial for promoting essential reactions, excess ceria was detrimental due to the increase in oxygen storage capacity. Additionally, insights into potential reaction pathways for NH3 production were determined.
url http://www.sciencedirect.com/science/article/pii/S1566736721000315
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