NOx storage and reduction over copper-based catalysts. part 3: Simultaneous NOx and soot removal

Agustín Bueno-López*, Dolores Lozano-Castelló, Alan J. McCue, James A. Anderson

*Corresponding author for this work

Research output: Contribution to journalArticle

23 Citations (Scopus)
6 Downloads (Pure)

Abstract

5% copper catalysts with Ce0.8M0.2Oδ supports (M = Zr, La, Ce, Pr or Nd) were studied for the simultaneous combustion of soot and removal of NOx by the NSR method. The simultaneous chemisorption of NOx and combustion of soot could be carried out above 375 °C, and nitrates were formed upon NOx chemisorption above this temperature. The nature of the M dopant played an important role in the chemisorption of NOx and in the catalysed soot-NOx reaction. As a general trend, the presence of soot had a negative impact on NOx removal by catalysts with very basic supports but had no effect or a positive influence if the support is not very basic. The combustion of soot has a very negative impact for NOx chemisorption on the catalyst with the most basic dopant (CuO/Ce0.8La0.2Oδ), because the CO2 formed in the reaction of soot combustion competes with NOx for adsorption sites. On the other hand, soot combustion does not affect NOx chemisorption on the catalyst with the most acidic dopant (CuO/Ce0.8Zr0.2Oδ), and the removal of NOx increases in this case because the reduction of NOx by soot contributes to NOx removal. The simultaneous reduction of NOx to N2 and soot combustion can be carried out under NSR conditions at 400 °C over the 5%Cu/Ce0.8Pr0.2Oδ catalyst and with H2 micropulses, and the NSR process has a positive impact on the catalytic combustion of soot.

Original languageEnglish
Pages (from-to)266-275
Number of pages10
JournalApplied Catalysis B: Environmental
Volume198
Early online date28 May 2016
DOIs
Publication statusPublished - 5 Dec 2016

    Fingerprint

Keywords

  • Ceria
  • Copper catalyst
  • DeNOx
  • DRIFTS
  • NSR
  • Operando
  • Soot

ASJC Scopus subject areas

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

Cite this