NOx storage and reduction properties of model manganese-based lean NOx trap catalysts

Zhao shun Zhang, Bing bing Chen, Xin kui Wang, Li Xu, Chaktong Au, Chuan Shi, Mark Crocker

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

In order to study the role of manganese in LNT catalysis, model Pd/Mn/Ba/Al, Pd/Mn/Al and Pd/Ba/Al catalysts were prepared and characterized. Both Mn-containing catalysts exhibited higher activity for NO oxidation to NO2 than the Pd/Ba/Al reference catalyst, although NOx-TPD experiments showed that adsorbed NOx species were weakly bound on Pd/Mn/Al. Consequently, the presence of Ba was essential for high storage capacity. Compared to the Pd/Ba/Al reference, Pd/Mn/Ba/Al showed significantly improved NOx conversion under lean-rich cycling conditions as a consequence of its increased activity for NO oxidation and hence, superior NOx storage efficiency. In addition, the presence of Mn greatly lessened the inhibiting effects of H2O and CO2 on cycle-averaged NOx conversion, this being due to the facile decomposition of manganese carbonate at low temperatures as evidenced by DRIFTS. Significantly, the Pd/Mn/Ba/Al catalyst displayed comparable activity to a traditional LNT catalyst of the Pt/Ba/Al type, showing the promising prospect of such new type of LNT catalysts.

Original languageEnglish
Pages (from-to)232-244
Number of pages13
JournalApplied Catalysis B: Environmental
Volume165
DOIs
StatePublished - Apr 1 2015

Bibliographical note

Funding Information:
The work was supported by the National Natural Science Foundation of China (Nos. 21373037 , 21073024 and 21176037 ). MC thanks the National Science Foundation and the U.S. Department of Energy (DOE) for financial support under award no. CBET-1258742. However, any opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily reflect the views of the DOE.

Publisher Copyright:
© 2014 Elsevier B.V.

Keywords

  • Manganese
  • NO adsorber
  • NO oxidation
  • NO storage-reduction
  • Palladium

ASJC Scopus subject areas

  • Catalysis
  • Environmental Science (all)
  • Process Chemistry and Technology

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