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The Pt/CeO 2 nanocomposites of Pt nanoparticles partially confined in the mesopores of microsized mesoporous CeO 2 (1.0% Pt/CeO 2 -MM) or supported on the surface of CeO 2 nanocubes (1.0% Pt/CeO 2 -NC) with the same Pt loading of 1.0 wt % were prepared by the impregnation of microsized mesoporous CeO 2 or CeO 2 nanocubes with Pt(NO 3 ) 2 aqueous solution, followed by the reduction with NaBH 4 aqueous solution. 1.0%Pt/CeO 2 -MM exhibits much higher catalytic activity for benzene oxidation than 1.0%Pt/CeO 2 -NC. Compared to 1.0% Pt/CeO 2 -NC, the reaction temperatures of T 50 and T 90 (corresponding to a benzene conversion = 50% and 90%) for 1.0% Pt/CeO 2 -MM tremendously decreases by Δ T 50 = 149 °C and Δ T 90 = 196 °C, respectively. The turnover frequency (TOF) of 1.0% Pt/CeO 2 -MM at 140 °C increases by 9.0 times as compared to that of 1.0% Pt/CeO 2 -NC. The tremendous enhancement in the catalytic activity is due to a novel metal support interaction in 1.0% Pt/CeO 2 -MM. The novel metal support interaction is theoretically studied by density function theory (DFT) calculation and experimentally studied by CO-TPR, CO-TPD, H 2 pulse titration, and HRTEM. The theoretical and experimental evidence reveal that the partial confinement of Pt nanoparticles in the mesopores of microsized mesoporous CeO 2 leads to a significant enhancement in the activity of the surface lattice oxygen around the interface between Pt nanoparticles and CeO 2, thus tremendously increasing the catalytic activity.
Mao et al. (Mon,) studied this question.