The positive effect of hydrogen on the reaction of nitric oxide with carbon monoxide over platinum and rhodium catalysts

Ralf Dümpelmann*, Noel W. Cant, David L. Trimm

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    19 Citations (Scopus)

    Abstract

    The effect of adding 330-4930 ppm hydrogen to a reaction mixture of NO and CO (2000 ppm each) over platinum and rhodium catalysts has been investigated at temperatures around 200-250°C. Hydrogen causes large increases in the conversion of NO and, surprisingly, also of CO. Oxygen atoms from the additional NO converted are eventually combined with CO to give CO2 rather than react with hydrogen to form water. This reaction is described by CO + NO +3/2H2 → CO2 + NH3 and accounts for 50-100% of the CO2 formed with Pt/Al2O3 and 20-50% with Rh/Al2O3. With the latter catalyst a substantial amount of NO converted produces nitrous oxide. Comparison with a known study of unsupported noble metals suggests that isocyanic acid (HNCO) might be an important intermediate in a reaction system with NO, CO and H2 present.

    Original languageEnglish
    Pages (from-to)357-369
    Number of pages13
    JournalCatalysis Letters
    Volume32
    Issue number3-4
    DOIs
    Publication statusPublished - Sep 1995

    Keywords

    • carbon monoxide
    • hydrogen
    • nitric oxide
    • Pt/AlO
    • Rh/AlO

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