An increasing trend of δ is observed with the increase in the content of praseodymium, reflecting the better reducibility and, in turn, improved oxygen mobility in both atmospheres since the oxygen amount evolved is very high (and not only affecting the surface oxygen, as previously commented and explained below in more detail).
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Nanostructured Pr-Rich Ce<sub>x</sub>Pr<sub>1-x</sub>O<sub>2-δ</sub> Mixed Oxides for Diesel Soot Combustion: Importance of Oxygen Lability.
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