Synthesis of Ammonium Cyanate and Urea by Reduction of Nitric Oxide on Platinum, Rhodium, and Ruthenium Catalysts

See allHide authors and affiliations

Science  19 May 1978:
Vol. 200, Issue 4343, pp. 759-761
DOI: 10.1126/science.200.4343.759


Nearly quantitative conversion of nitric oxide (NO) into N2H4CO has been obtained in the reduction of NO with carbon monoxide and hydrogen over platinum and rhodium catalysts. Depending on the temperature of collection, N2H4CO is isolated as ammonium cyanate or its isomer, urea. The process is an effective way of recovering fixed nitrogen from dilute industrial streams containing NO. Ammonium cyanate may play a role in the reduction of NO in automotive exhaust control.