A series of hollow multi-shelled CeO (HoMS-CeO) support materials with tunable shell numbers were fabricated and applied to the catalytic oxidation of toluene. HoMS-CeO possess much higher catalytic activity (T = 236 ℃) than hollow CeO with only a single shell (h-CeO) (T = 275℃). The porous multiple-shelled structure has a higher S, which strongly promotes gas distribution and provides more active sites. The superiority of this kind of structure was also verified by comparing h-CoO and HoMS-CoO. Furthermore, Pt-Co bimetallic nanoparticles were loaded onto HoMS-CeO. The synergistic effect between Pt and Co was verified by XPS and O-TPD, which was observed to allow electron transfer between Pt and Co and thus regulate the electronic state of the Pt. Compared with Pt alone, Pt-Co bimetallic nanoparticles could stronglypromotethe activation of Oand oxygen mobility, as revealed by a much higher O content and a lower oxygen desorption temperature. Of the catalysts prepared in this study, the 1 wt% PtCo/CeO catalyst was found to be the most suitable for toluene oxidation owing to its excellent activity (T = 158 ℃), long-term stability, and water resistance. Finally, in situ DRIFTS was employed to investigate mechanism during toluene oxidation and the possible reaction pathway was proposed.
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