The Coupling Effect Of Lattice Oxygen and Surface Adsorbed Oxygen in Bimetallic Catalyst for Toluene Catalysis

Bimetal PtFe 3 nanoparticles were synthesized to obtain the 5.8% PtFe 3 -CeO 2 catalyst, which showed a high toluene oxidation activity (T 100 =226 ℃), an excellent catalytic stability (125 h, >99.5%) and a good water resistance ability (70h, >99.5%). To clarify the coupling effect of lattice oxygen and surface adsorbed oxygen, 6.2% PtFe 3 -C was also synthesized to conduct the same experiments which only had the surface adsorbed oxygen species. Through the detailed XPS analysis, oxygen cycle experiment, hydrogen reduction experiment, and in-situ DRIFT experiment, we could deduced that PtFe 3 -CeO 2 had two reaction pathways, and the surface adsorbed oxygen played a dominant role due to the fast cycle between the surface adsorbed oxygen and oxygen vacancy, while the lattice oxygen played a key role due to the relationship between the toluene oxidation activity and the metal­oxygen bond energy. Furthermore, DFT simulation verified Pt sites are dominant reaction active sites during this reaction