Evaluation and mechanistic investigation of a AuPd alloy catalyst for the hydrocarbon selective catalytic reduction (HC-SCR) of NOx

Conor Hamill, Robbie Burch, Alexandre Goguet, David Rooney*, Hafedh Driss, Lachezar Petrov, Muhammad Daous

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The ability of a gold palladium bimetallic catalyst to selectively oxidise toluene has been used to enhance the hydrocarbon selective catalytic reduction of NOx, a reaction in which the interaction of partial oxidation intermediates is considered important. The combination of gold with palladium has a synergistic effect, producing a catalyst that is more active for NOx conversion than the arithmetic sum of the corresponding mono-metallic materials. Three regimes in the conversion profile of the AuPd catalyst are proposed relating to production and consumption of toluene derived species, such as benzaldehyde and benzonitrile. The possible role of these reaction intermediates in the toluene HC-SCR reaction is examined. Using 15NO, the formation of N2 and N2O is observed via the direct interaction between the nitrogen atom of benzonitrile and 15NO. The higher activity of the bimetallic catalyst for the NOx reduction reaction by toluene is discussed in the context of these partial oxidation intermediates.
Original languageEnglish
Pages (from-to)864-870
Number of pages7
JournalApplied Catalysis B: Environmental
Volume147
Early online date09 Oct 2013
DOIs
Publication statusPublished - 05 Apr 2014

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