Reactions of adsorbed NO and CO on Rh(111) were studied with temperature pr
ogrammed reaction spectrometry, using isotopically labeled (CO)-C-13 to ena
ble discrimination between N-2 and CO, and N2O and CO2. Dissociation and de
sorption of NO are hardly influenced by the presence of CO, whereas repulsi
on between NO and CO destabilizes CO, enhancing its desorption and diminish
ing the production of CO2. (C) 1999 Elsevier Science B.V. All rights reserv
ed.