Noble Metals Associated with Ceria

Conclusion on Noble Metals Associated with Ceria 

All studies concerning noble metals deposited onto ceria or ceria containing solid solutions reveal some important behaviours always observed in oxidising conditions similar to those encountered in catalytic combustion  

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Conclusion on Noble Metals Associated with Ceria 420... 

Of the noble metals, palladium exhibits the highest activity for CO oxidation.As already mentioned for Pd-promoted CeCoO catalysts, the reaction over a noble metal supported on ceria involves a cooperative effect between the metals and the oxide, the so-called dual site mechanism. A recent study by temporal analysis of products (TAP) experiments for Pt supported over ceria showed two independent sites with different activities. The high activity site was associated with the metal/support interface and the low activity one was located on the support. The different sites were characterized by two different activation energies. Moreover, at variance with the stable number of high activity sites, the number of the low active sites increased with reaction temperature. 

A lot of studies have been published concerning ceria, pure or doped, associated with a noble metal for boosting activity in catalytic combustion. The main metals studied are Pt and Pd essentially, but some studies concern Rh and Ag. 

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