Abstract
A bi-functional catalyst containing a stable cubic cerium-zirconium oxide phase was prepared and used for CO preferential oxidation. Pure ceria was observed to achieve the highest CO conversion of over 95% at >300°C. A bi-functional ceria-zirconia successfully reduced the reaction temperature to 200°C but at the expense of lower conversion of 85%. The bi-functional catalyst containing copper species at 5wt% of the metal precursor demonstrated the ability to oxidize CO completely at 115°C. This was made possible by the high oxygen storage capacity (OSC) of the catalyst which was measured to be 707.7μmolO2/g.
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