Positive effects of K+ in hybrid CoMn-K and Pd/Ba/Al2O3 catalysts for NOx storage and reduction

Zhifeng Bai, Bingbing Chen, Qi Zhao, Chuan Shi, Mark Crocker

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

CoMn-K was mechanically mixed with a Pd/Ba/Al2O3 catalyst to enhance its NOx storage and reduction properties. The Pd/Ba/Al2O3 and CoMn-K mixture showed a synergetic effect with respect to NOx storage capacity and improved NOx reduction ability. The addition of K+ ions promoted the catalytic performance by increasing NO oxidation activity and therefore NOx storage via the creation of active surface oxygen species on the catalysts. The stored NOx reduction by H2 was also improved, being ascribed to the fact that Pd was mainly present as Pd0 due to the electronic interactions between Pd and K+ ions. NOx conversions and N2 selectivity at low temperatures (80–200 °C) could be further enhanced by assistance of non-thermal plasma in rich phase.

Original languageEnglish
Pages (from-to)333-345
Number of pages13
JournalApplied Catalysis B: Environmental
Volume249
DOIs
StatePublished - Jul 15 2019

Bibliographical note

Funding Information:
The work was supported by the National Key R&D Program of China (No. 2017YFA0700103 ), and National Natural Foundation of China (Nos. 21577013 and 21707015 ).

Publisher Copyright:
© 2019 Elsevier B.V.

Keywords

  • Hybrid catalyst
  • NO storage and reduction
  • Non-thermal plasma
  • Potassium ions

ASJC Scopus subject areas

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

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