Investigation of the COÂ +Â NO reaction over the Cu(0Â 0Â 1) surface

Coadsorption of NO + CO and CO + NO on Cu(0 0 1) at 115 K was investigated by valence band and core-level photoelectron spectroscopy based on the use of synchrotron radiation (SR-PS). Site exchange between NO and CO takes place when a CO saturated Cu(0 0 1) surface is exposed to NO. Both molecular and dissociated NO are observed on the surface. The effect of heating to 300 K was followed. The opposite adsorption sequence, CO exposure of the Cu(0 0 1) surface with preadsorbed NO, results in oxidation of CO and bonding of CO2. Heating to 300 K causes desorption of the adsorbed CO2, NO and N.