The rapid and reversible dispersion of palladium nanoparticles is considerably enhanced if oxygen gas is present in the oxidizing step of the redox cycle. At 673 K oxidation of the Pd nanoparticles is too slow to compete with this dispersion and only occurs after the Pd particles undergo significant size/morphological alteration. Thus, catalyst dispersion and sintering could be controlled by dynamic feedstock management.
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Newton et al. (2007) studied this question.