Re-dispersion of Platinum Supported on Ceria-based Oxide

Re-dispersion of Platinum Supported on Ceria-based Oxide 

Nishihata et al. (2002) reported the re-dispersion of Pd in a Perovskite-type oxide. They investigated the oxidation state and the local structure of Pd by using X-ray absorption analysis. Pd occupies the -site in La2PdCo06 in the oxidized sample. For the reduced catalyst, the XAD and XANES measurements suggested the segregation of metallic Pd from the perovskite crystal. They imply that Pd also moves back and forth between the -site in the perovskite structure and sites within the lattice of Pd metal clusters dispersed on perovskite surface when the catalyst is exposed to fluctuations in the redox characteristics of the emission exhaust. 

The re-dispersion phenomena of sintered Pt on CZY were observed by in situ time-resolved Turbo-XAS in fluorescence mode at ID-24 of ESRF (Nagai et al., 

Along with the concern in the pollutants of NOx, CO and HC, the care about the emission of C02 is also increasing. Today, fuel-efficient lean-burn engines 

The NOx reduction for the exhaust from lean-burn engine is one of the greatest challenges in environmental protection, and a lot of researchers have strived to develop more effective catalysts by many ways. Their efforts could be possibly categorized into four approaches (1) NOx direct decomposition, (2) selective catalytic reduction on NOx with hydrocarbons (HC SCR), 

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