The Reduction of NO by CO in the Presence of Water Vapour on Supported Platinum Catalysts: Formation of Isocyanic Acid (HNCO) and Ammonia

Noel W. Cant*, Dean C. Chambers, Irene O Y Liu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    31 Citations (Scopus)

    Abstract

    The reaction of NO with excess CO in the presence of water vapour has been studied for silica- and alumina-supported platinum. With Pt/SiO2, HNCO is the dominant nitrogen-containing product between 300 and 400°C, with a yield of up to 50%. Higher temperatures favour NH3 formation due to HNCO hydrolysis and shifts in surface populations that can be interpreted in terms of the NO + CO and water-gas shift reactions. When excess water is present, the hydrolysis activity of Pt/Al2O3 is sufficient to convert all HNCO to NH3. The yield of NH3 exceeds 75% at temperatures above 280°C, where conversion of NO becomes complete. Insufficient water leads to the formation of Al-NCO groups and a loss of activity that can be reversed by additional water. Pt/CeO2 behaves similarly to Pt/Al2O3. Pd/SiO2 also generates some HNCO, but the concentrations made are much less than that over Pt/SiO2 due to a higher activity for the NO + CO reaction and a lower activity for the CO + H2O one.

    Original languageEnglish
    Pages (from-to)551-559
    Number of pages9
    JournalApplied Catalysis B: Environmental
    Volume46
    Issue number3
    DOIs
    Publication statusPublished - 28 Nov 2003

    Keywords

    • Ammonia formation
    • Isocyanic acid (HNCO)
    • NO reduction of CO
    • Pt/AlO
    • Pt/SiO

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