Origin of double dinitrogen release feature during fast switching between lean and rich cycles for NOx storage reduction catalysts

Sarayute Chansai, R. Burch, C. Hardacre, Shuichi Naito

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The performance of NOx storage and reduction over 1.5 wt% Pt/20 wt% KNO3/K2Ti8O17 and 1.5 wt% Pt/K2Ti8O17 catalysts has been investigated using combined fast transient kinetic switching and isotopically labelled (NO)-N-15 at 350 degrees C. The evolution of product N-2 has revealed two significant peaks during 60 s lean/1.3 s rich switches. It also found that the presence of CO2 in the feed affects the release of N-2 in the second peak. Regardless of the presence/absence of water in the feed, only one peak of N-2 was observed in the absence of CO2. Gas-phase NH3 was not observed in any of the experiments. However, in the presence of CO2 the results obtained from in situ DRIFTS-MS analysis showed that isocyanate species are formed and stored during the rich cycles, probably from the reaction between NOx and CO, in which CO was formed via the reverse water-gas shift reaction. 

    Original languageEnglish
    Pages (from-to)91-98
    Number of pages8
    JournalJournal of Catalysis
    Volume317
    DOIs
    Publication statusPublished - Aug 2014

    Keywords

    • NOx storage reduction
    • Lean/rich cycles
    • CO
    • H-2
    • K2Ti8O17
    • Fast transient kinetics
    • DRIFTS-MS
    • Isocyanates
    • Reverse water-gas shift
    • IN-SITU FTIR
    • NSR CATALYSTS
    • STORAGE/REDUCTION CATALYST
    • PT/BAO/AL2O3 CATALYSTS
    • TRAP CATALYST
    • NO(X) STORAGE
    • LNT CATALYST
    • STORED NOX

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