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

Hyunwook Kim, Ki Bong Lee

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

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.

Original languageEnglish
Article number143895
JournalChemical Engineering Journal
Volume470
DOIs
Publication statusPublished - 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

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