Comparative study of the oxygen storage capacity of Pt/MxOy/Al2O3 systems

摘要

The oxygen storage capacity of 1% Pt/1 5% MxOy/Al2O3 systems containing a rare-earth or an alkaline-earth metal oxide or TiO2 as the oxygen-storing component was studied. Oxygen storage capacity was evaluated as the amount of C3H8 reacting at 400 degrees C with oxygen that was taken up by the catalyst during oxidative treatment. The systems containing a rare-earth metal oxide or TiO2 possess the highest oxygen storage capacity among the catalysts examined (80 and 75 mu mol C3H8/g Cat, respectively). Of the BaO and SrO systems, the latter is of interest, although its oxygen storage capacity (similar to 27 mu mol C3H8/g Cat) is somewhat lower than the oxygen storage capacity of any rare-earth metal oxide or the TiO2 system.