Flower-like Pt/Fe 2 O 3 –CeO 2 Catalysts for Highly Efficient Low-Temperature Catalytic Oxidation of Toluene

作者：Yuanbo Zhou, Jiaqin He, Dongyun Chen, Xunxun Li, Yaru Wang, Jun Xiao, Najun Li, Qingfeng Xu, Hua Li, Jinghui He, Jianmei Lu · 发表于：Industrial & Engineering Chemistry Research · 年份：2021 · DOI：10.1021/acs.iecr.1c00108 · 被引用次数：31 · 研究领域：Catalytic Processes in Materials Science、Catalysis and Oxidation Reactions、Electrocatalysts for Energy Conversion

A series of porous Pt/Fe x Ce y 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/Fe 3 Ce 1 performed the best, with a reaction temperature for 90% toluene conversion of 192 °C at a WHSV of 36,000 mL/(h·g). The synergistic effect of Fe 2 O 3 and CeO 2 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.