Two aspects of the reactions of mixtures of H2, NO and CO over supported Pt catalysts have been investigated in detail. With Pt/SiO2 isocyanic acid, HNCO, is a substantial gaseous product over a wide range of conditions. Its formation persists with O2 also present provided the concentration of unreacted CO is sufficient to populate the Pt surface. Added water causes some loss of HNCO due to hydrolysis. With Pt/Al2O3 the rate of hydrolysis is so fast that no HNCO is seen. Combined in situ FTIR and isotope transient measurements show that this hydrolysis occurs largely through the intermediate formation of surface NCO groups on the alumina component of the catalyst.
|Number of pages||10|
|Journal||Studies in Surface Science and Catalysis|
|Publication status||Published - 1996|