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

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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.

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Authors and Affiliations

  1. School of Chemistry, Macquarie University, NSW 2109, Australia

    Ralf Dümpelmann & Noel W. Cant

  2. School of Chemical Engineering and Industrial Chemistry, University of New South Wales, NSW 2052, Kensington, Australia

    David L. Trimm

Authors
  1. Ralf Dümpelmann
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  2. Noel W. Cant
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  3. David L. Trimm
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Dümpelmann, R., Cant, N.W. & Trimm, D.L. The positive effect of hydrogen on the reaction of nitric oxide with carbon monoxide over platinum and rhodium catalysts. Catal Lett 32, 357–369 (1995). https://doi.org/10.1007/BF00813230

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  • DOI: https://doi.org/10.1007/BF00813230

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