Formation of isocyanic acid during the reaction of mixtures of NO, CO and H2 over supported platinum catalysts

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)


On-line infrared spectroscopy has been used to show that isocyanic acid, HNCO, is a substantial primary product of the reaction between NO, CO and H2 over a Pt/SiO2 catalyst. At 230°C it accounts for more than 40% of the CO converted. No isocyanic acid is seen when Al2O3 is placed downstream of Pt/SiO2, or when using a Pt/Al2O3 catalyst under the same conditions, due to rapid hydrolysis of HNCO on the alumina. Isocyanic acid may exist as a trace intermediate in automobile catalytic converters during their warm-up phase but it is unlikely to emerge from the pore system of aluminabased catalysts.

Original languageEnglish
JournalApplied Catalysis B, Environmental
Issue number4
Publication statusPublished - 30 Sep 1995


  • HNCO
  • Isonyanic acid
  • NO/CO/H mixtures
  • Platinum
  • Pt/AlO
  • Pt/SiO


Dive into the research topics of 'Formation of isocyanic acid during the reaction of mixtures of NO, CO and H<sub>2</sub> over supported platinum catalysts'. Together they form a unique fingerprint.

Cite this