Temperature-programmed reduction of lightly yttrium-doped Au/CeO2 catalysts

The reducibility of Au catalysts on CeO2 supports
doped with 1 and 2.5 mass% Y2O3 by two types of
preparation methods (impregnation and co-precipitation)
has been studied by temperature-programmed reduction
and compared with that of pure Au/CeO2. The kinetic
parameters of reduction were determined simulating each
reduction process. The capacities of these catalysts to
retain oxygen have been evaluated by temperature-programmed
desorption. The catalytic activities in water gas
shift reaction were determined measuring CO conversion
between 413 and 623 K. The catalytic performances of all
these catalysts were explained in terms of mobility of the
oxygen ions of the CeO2 lattice.