STUDY OF THE CO-CEO2 INTERACTION IN PRESENCE OF HIGHLY DISPERSED RHODIUM

The interaction of CO at room temperature with a ceria supported rhodi um catalyst was investigated using TPD-MS and a magnetic balance. The results have shown important differences in comparison with the H-2-Rh /CeO2 system. In the presence of rhodium, the treatment with CO result ed in a much smaller degree of reduction of CeO2 than with hydrogen. W hen, after CO adsorption at 294 K, the catalyst was heated at 773 K un der vacuum, the reduction extent increased. In the case of hydrogen, t he thermodesorption at 773 K almost completely reoxidized the ceria su rface.