Flower-like Pt/Fe2O3-CeO2 Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

A series of porous Pt/FexCey microflowers have been synthesized through a solvothermal method. The well-defined mesoporous structure promotes gas distribution as well as even dispersion of active species, thus exposing more active sites and improving the catalytic efficiency for low-temperature toluene removal. The catalyst composition can be regulated by changing the Fe/Ce molar ratio and Pt loading content. Among the samples, 1 wt % Pt/Fe3Ce1 performed the best, with a reaction temperature for 90% toluene conversion of 192 degrees C at a WHSV of 36,000 mL/(h.g). The synergistic effect of Fe2O3 and CeO2 promotes electron transfer and migration of oxygen species. Addition of Pt enhances the mobility of lattice oxygen, generating a high concentration of active surface lattice oxygen, which facilitates toluene removal. The Mars-van Krevelen model could be applied to explain the mechanism of toluene oxidation over these Fe-based catalysts.

Automated summary

A series of porous Pt/FexCey microflowers with well-defined mesoporous structure were synthesized through a solvothermal method, promoting gas distribution and even dispersion of active species. Among the samples, 1 wt % Pt/Fe3Ce1 showed the best catalytic performance, with the catalyst composition able to be regulated for improved catalytic efficiency. The synergistic effect of Fe2O3 and CeO2, along with the addition of Pt, enhanced the mobility of lattice oxygen and facilitated toluene removal. The Mars-van Krevelen model was used to explain the mechanism of toluene oxidation over these Fe-based catalysts.