Non-thermal plasma assisted NOx storage and reduction over a cobalt-containing Pd catalyst using H2 and/or CO as reductants

Zhao Shun Zhang, Mark Crocker, Li Mei Yu, Xin Kui Wang, Zhi Feng Bai, Chuan Shi

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A catalyst of the type Pd/Co/Ba/Al was examined for lean NOx trap (LNT) applications, and compared with Pd/Ba/Al and Pt/Ba/Al reference catalysts for NOx storage and reduction using H2 and/or CO as reducing agents. The activity of Pt/Ba/Al was greatly depressed when using CO as reductant at low temperatures owing to the strong poisoning effect of CO on Pt. The Pd/Co/Ba/Al catalyst exhibited higher activity for NO oxidation to NO2 and better NOx storage capacity than Pt/Ba/Al and Pd/Ba/Al catalysts, also showed higher NOx reduction activity with CO compared to the other two catalysts. However, it shows relatively low NOx removal efficiency below 250 °C, especially using CO as reductants, indicating that regeneration of stored NOx is the rate limiting step. By employing non-thermal plasma in the rich phase to assist reduction of the stored NOx, the Pd/Co/Ba/Al sample exhibited excellent NOx removal efficiency under plasma assisted lean/rich cycling conditions, affording NOx conversions close to 99% over a broad temperature window of 150-350 °C, even when using CO as the reducing agent.

Original languageEnglish
Pages (from-to)175-182
Number of pages8
JournalCatalysis Today
Volume258
DOIs
StatePublished - May 14 2015

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

Keywords

  • Carbon monoxide
  • Cobalt
  • NO storage-reduction
  • Non-thermal plasma
  • Palladium

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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