Abstract
A CeO 2–Ag catalyst with a ‘rice-ball’ morphology, consisting of Ag particles in the center surrounded by fine CeO 2 particles, exhibits exceptional catalytic performance for soot oxidation by O 2 below 300 °C. The reaction mechanism over this catalyst was studied by O 2 temperature-programmed desorption (O 2-TPD), 18O/ 16O isotopic exchange (IE) reaction, and electron spin resonance (ESR) techniques. It is speculated that adsorbed oxygen species on the Ag surface migrate to the CeO 2 surface via the Ag/CeO 2 interface to form O n x - species (at least partly O 2 - ) and further migrate onto the soot particles. Due to morphological compatibility of the moderately large Ag particles (ca. 30–40 nm) and the extremely large interfacial area with the CeO 2 particles, the formation and migration rates of the oxygen species on the CeO 2–Ag catalyst are efficiently promoted, resulting in its distinguished catalytic performance and relative insensitivity to the contact mode of the soot–catalyst mixture.
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