Temperature programmed desorption study of the reaction of C2H4 and CO on Rh supported on alpha-Al2O3(0001), YSZ(100) and CeO2 thin films

The reaction of CO and ethylene on oxide-supported Rh particles was studied using temperature programmed desorption. The model systems investigated co nsisted of Rh particles on the following oxide supports: alpha -Al2O3(0001) , yttria-stabilized zirconia (100) EYSZ(100)], CeO2 thin film on alpha -Al2 O3(0001) and CeO2 thin film on YSZ(100). The results of this study demonstr ate that both the ceria and YSZ supports are able to donate oxygen for reac tion with carbon species adsorbed on the supported Rh particles. The reduci bility of the ceria thin films was found to be influenced by the underlying oxide supports. Ceria films supported on YSZ(100) underwent reduction upon heating to 900 K, while those on alpha -Al2O3(0001) did not. (C) 2000 Else vier Science B.V. All rights reserved.