Abstract
Adsorption of NO on evacuated CeO 2 has been investigated by gravimetric, IR, and ESR measurements. On reduced sites, NO was decomposed into N 2 or N 2O accompanied by incorporation of oxygen into the surface. The oxygen adsorbed on the surface was identified by infrared study. Simultaneously, the hyponitrite ion which could be a precursor to the formation of N 2 and N 2O was detected. On a partially reduced surface, NO was adsorbed as a chelating NO 2 species consisting of adsorbed NO and surface oxygen. Furthermore, dinitrosyl complex Ce(NO) 2 and adsorbed radical were detected as the reversibly adsorbed species.
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