Abstract
The interaction of NO and CO with Rh supported on highly dealuminated zeolite Y (US-Ex) has been investigated by FTIR spectroscopy at temperatures between 300 and 573 K. The interaction of NO with oxidized or reduced Rh/US-Ex results in the formation of a well defined Rh dinitrosyl species with IR bands at 1855 and 1780 cm–1. Other surface nitrosyl species were found to be dependent on the Rh particle size and the interaction conditions. With CO and NO in the gas phase well defined mixed surface complexes RhI(CO)(NO)2(νCO= 2103 cm–1; νNO= 1772, 1711 cm–1) and Rh(CO)2(NO)(νCO= 2162, 2128 cm–1; νNO= 1786 cm–1) were observed at room temperature in addition to RhI(CO)2 and RhI(NO)2. At higher temperatures, gaseous N2O and CO2 and isocyanate, adsorbed on the support, were observed depending on the conditions.
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