Capture-bonding Super Assembly of Nanoscale Dispersed Bimetal on Uniform CeO2 Nanorod for the Toluene Oxidation
Graphical As shown in the following figure, for PtFe 3 −C, toluene was directly adsorbed on the surface oxygen position and finally converted into H 2 O and CO 2 . For PtFe 3 −CeO 2 , two reaction channels containing both lattice oxygen (blue ball) from CeO 2 and surface oxygen (pink ball) and result in a better toluene catalytic performance than PtFe 3 −C. Elimination of VOCs by catalytic oxidation is an important technology. Here, a general synergistic capture-bonding superassembly strategy was proposed to obtain the nanoscale dispersed 5.8% PtFe 3 −CeO 2 catalyst, which showed a high toluene oxidation activity (T 100 =226 °C), excellent catalytic stability (125 h, >99.5%) and a good water resistance ability (70 h, >99.5%). Through the detailed XPS analysis, oxygen cycle experiment, hydrogen reduction experiment, and in-situ DRIFT experiment, we could deduce that PtFe 3 −CeO 2 had two reaction pathways. The surface adsorbed oxygen resulting from PtFe 3 nanoparticles played a dominant role, due to the fast cycling between the surface adsorbed oxygen and oxygen vacancy. In contrast, the lattice oxygen resulting from CeO 2 nanorods played an important role due to the relationship between the toluene oxidation activity and the metal-oxygen bonding energy. Furthermore, DFT simulation verified Pt sites were the dominant reaction active sites during this reaction.
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