Enahncement of the reaction of nitric oxide and carbon monoxide by hydrogen and water over platinum and rhodium-containing catalysts

R. Dümpelmann*, N. W. Cant, D. L. Trimm

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The addition of hydrogen or water to a stoichiometric mixture of CO and NO over supported platinum and rhodium catalysts can significantly increase the conversion of both NO and CO. Theselectivity of NO reduction is also affected in a remarkable manner. With Pt/Al 2O 3 at 210°C, for example, addition of, ≈900 ppm H 2 increases the NO conversion from 6% to 48% and that of CO from 5% to 33%. The nitrogen atom of NO is converted quite selectively to NH 3 while the oxygen atom forms CO 2 rather than water. Addition of, ≈1400 ppm water also enhances both CO and NO conversion over Pt/Al 2O 3 but N 2 rather than NH 3 is the favoured product. Hydrogen and water also produce significant rate enhancements with Rh/Al 2O 3 and Rh/CeO 2/Al 2O 3 but the product distributions are somewhat different from those with Pt/ Al 2O 3. Possible reasons for the enhanced activities and the observed selectivities are discussed.

Original languageEnglish
Pages (from-to)123-135
Number of pages13
JournalStudies in Surface Science and Catalysis
Volume96
Issue numberC
DOIs
Publication statusPublished - 1995

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