Abstract
The reaction of CO and NH 3 over preoxidized Ru/Al 2O 3 has been investigated using infrared spectroscopy. An isocyanate (NCO) surface intermediate providing an infrared band in the range 2246–2256 cm −1 was detected. The NCO species formed on Ru and then migrated to the A1 2O 3 support. The species was detected in the temperature ranges 298–340 K and 383–500 K, but disappeared between 340 and 383 K, indicating that two different mechanisms of formation were operable. Studies of the decomposition of formamide over preoxidized Ru/Al 2O 3 indicated that the low temperature formation of NCO in the CO/NH 3 reaction probably involved an amide intermediate.
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