Enhanced low-temperature NOx storage and reduction performance using Cu-loaded lean NOx trap catalysts

Hyunwook Kim; Ki Bong Lee

doi:10.1016/j.cej.2023.143895

Enhanced low-temperature NO_x storage and reduction performance using Cu-loaded lean NO_x trap catalysts

Hyunwook Kim, Ki Bong Lee

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Lean NO_x trap (LNT) used in diesel-powered vehicles exhibit poor NO_x storage and reduction (NSR) performance during low-temperature operation, particularly under cold-start conditions. To overcome this limitation, Cu was added to a conventional LNT catalyst (Pt-Ba/γ-Al₂O₃, PBA) to improve the NO_x storage and regeneration performance of the Cu-loaded Ba adsorbent (Cu-Ba/γ-Al₂O₃) during low-temperature operation. However, a Pt-Cu complex was formed when Pt and Cu were used together as a one-body catalyst (Pt-Cu-Ba/γ-Al₂O₃, PCBA), leading to decreased catalytic performance. Physical mixing was investigated as a method to prevent the catalytic performance degradation caused by the Pt-Cu complex. The physical mixture of Pt/γ-Al₂O₃ and Cu-Ba/γ-Al₂O₃ (PA + CBA) could prevent the formation of Pt-Cu complex and yielded the highest NSR performance at 150 ℃ among the synthesized LNT catalysts. PA + CBA maintained a significantly improved NSR performance in lean-rich cycling tests using CO or H₂ as a reducing agent.

Original language	English
Article number	143895
Journal	Chemical Engineering Journal
Volume	470
DOIs	https://doi.org/10.1016/j.cej.2023.143895
Publication status	Published - 2023 Aug 15

Bibliographical note

Funding Information:
This study was supported by the Super Ultra Low Energy and Emission Vehicle Engineering Research Center of the National Research Foundation of Korea funded by the Korean government Ministry of Science and ICT (NRF-2016R1A5A1009592) and the Korea Institute of Marine Science and Technology Promotion (KIMST) funded by the Korean government Ministry of Oceans and Fisheries (20220568).

Publisher Copyright:
© 2023 Elsevier B.V.

Keywords

Cold-start condition
Cu-loading
Lean NO trap
NO storage and reduction
Physical mixing

ASJC Scopus subject areas

General Chemistry
Environmental Chemistry
General Chemical Engineering
Industrial and Manufacturing Engineering

Access to Document

10.1016/j.cej.2023.143895

Cite this

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title = "Enhanced low-temperature NOx storage and reduction performance using Cu-loaded lean NOx trap catalysts",

abstract = "Lean NOx trap (LNT) used in diesel-powered vehicles exhibit poor NOx storage and reduction (NSR) performance during low-temperature operation, particularly under cold-start conditions. To overcome this limitation, Cu was added to a conventional LNT catalyst (Pt-Ba/γ-Al2O3, PBA) to improve the NOx storage and regeneration performance of the Cu-loaded Ba adsorbent (Cu-Ba/γ-Al2O3) during low-temperature operation. However, a Pt-Cu complex was formed when Pt and Cu were used together as a one-body catalyst (Pt-Cu-Ba/γ-Al2O3, PCBA), leading to decreased catalytic performance. Physical mixing was investigated as a method to prevent the catalytic performance degradation caused by the Pt-Cu complex. The physical mixture of Pt/γ-Al2O3 and Cu-Ba/γ-Al2O3 (PA + CBA) could prevent the formation of Pt-Cu complex and yielded the highest NSR performance at 150 ℃ among the synthesized LNT catalysts. PA + CBA maintained a significantly improved NSR performance in lean-rich cycling tests using CO or H2 as a reducing agent.",

keywords = "Cold-start condition, Cu-loading, Lean NO trap, NO storage and reduction, Physical mixing",

author = "Hyunwook Kim and Lee, {Ki Bong}",

note = "Funding Information: This study was supported by the Super Ultra Low Energy and Emission Vehicle Engineering Research Center of the National Research Foundation of Korea funded by the Korean government Ministry of Science and ICT (NRF-2016R1A5A1009592) and the Korea Institute of Marine Science and Technology Promotion (KIMST) funded by the Korean government Ministry of Oceans and Fisheries (20220568). Publisher Copyright: {\textcopyright} 2023 Elsevier B.V.",

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AU - Kim, Hyunwook

AU - Lee, Ki Bong

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N2 - Lean NOx trap (LNT) used in diesel-powered vehicles exhibit poor NOx storage and reduction (NSR) performance during low-temperature operation, particularly under cold-start conditions. To overcome this limitation, Cu was added to a conventional LNT catalyst (Pt-Ba/γ-Al2O3, PBA) to improve the NOx storage and regeneration performance of the Cu-loaded Ba adsorbent (Cu-Ba/γ-Al2O3) during low-temperature operation. However, a Pt-Cu complex was formed when Pt and Cu were used together as a one-body catalyst (Pt-Cu-Ba/γ-Al2O3, PCBA), leading to decreased catalytic performance. Physical mixing was investigated as a method to prevent the catalytic performance degradation caused by the Pt-Cu complex. The physical mixture of Pt/γ-Al2O3 and Cu-Ba/γ-Al2O3 (PA + CBA) could prevent the formation of Pt-Cu complex and yielded the highest NSR performance at 150 ℃ among the synthesized LNT catalysts. PA + CBA maintained a significantly improved NSR performance in lean-rich cycling tests using CO or H2 as a reducing agent.

AB - Lean NOx trap (LNT) used in diesel-powered vehicles exhibit poor NOx storage and reduction (NSR) performance during low-temperature operation, particularly under cold-start conditions. To overcome this limitation, Cu was added to a conventional LNT catalyst (Pt-Ba/γ-Al2O3, PBA) to improve the NOx storage and regeneration performance of the Cu-loaded Ba adsorbent (Cu-Ba/γ-Al2O3) during low-temperature operation. However, a Pt-Cu complex was formed when Pt and Cu were used together as a one-body catalyst (Pt-Cu-Ba/γ-Al2O3, PCBA), leading to decreased catalytic performance. Physical mixing was investigated as a method to prevent the catalytic performance degradation caused by the Pt-Cu complex. The physical mixture of Pt/γ-Al2O3 and Cu-Ba/γ-Al2O3 (PA + CBA) could prevent the formation of Pt-Cu complex and yielded the highest NSR performance at 150 ℃ among the synthesized LNT catalysts. PA + CBA maintained a significantly improved NSR performance in lean-rich cycling tests using CO or H2 as a reducing agent.

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