The advancement of cost-effective Pt catalysts for volatile organic compound (VOC) combustion holds significant importance. Enhancing the adsorption and activation of O₂ and VOCs on catalysts is vital for VOC oxidation reaction. In this study, we utilized a two-step quenching method to alter iron rust, resulting in the deposition of Pt species on a Sn-doped Fe₂O₃ sample (Pt_q/Sn_q:Fe₂O₃). Experiments and theoretical calculations revealed that both the two-step quenching process and the Sn dopants would induce the generation of oxygen vacancies, improving the adsorption and mobility of oxygen species on Pt_q/Sn_q:Fe₂O₃. Also, the Sn doping would enhance the interaction between the Fe₂O₃ support and Pt to modulate the Pt’s electronic structure, promoting the adsorption of toluene and the desorption of product CO. Thus, the developed Pt_q/Sn_q:Fe₂O₃ exhibited boosted toluene/acetone oxidation activity, achieving 90% mineralization rate for toluene at 215 °C and acetone at 228 °C, respectively. In situ diffuse reflectance infrared Fourier transform spectroscopy showcased that the oxygen vacancy and Pt species with a modulated electronic structure synergistically heightened the activation of acetone/toluene, accelerated ring breakage of toluene, and brought about thorough oxidation of acetone on Pt_q/Sn_q:Fe₂O₃. This research could offer a potential avenue for fine-tuning the structure of active sites crucial for catalytic processes.

中文翻译：

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用于增强挥发性有机化合物催化氧化的锈衍生催化剂的多步淬火

开发用于挥发性有机化合物 (VOC) 燃烧的经济高效的 Pt 催化剂具有重要意义。增强催化剂对O ₂和VOCs的吸附和活化对于VOC氧化反应至关重要。在这项研究中，我们采用两步淬火方法来改变铁锈，导致 Pt 物质沉积在 Sn 掺杂的 Fe ₂ O ₃样品上 (Pt _q /Sn _q :Fe ₂ O ₃ )。实验和理论计算表明，两步淬火过程和Sn掺杂都会诱导氧空位的产生，提高氧物质在Pt _q /Sn _q :Fe ₂ O ₃上的吸附和迁移率。此外，Sn掺杂会增强Fe ₂ O ₃载体与Pt之间的相互作用，从而调节Pt的电子结构，促进甲苯的吸附和产物CO的解吸。因此，开发了Pt _q /Sn _q :Fe ₂ O ₃表现出增强的甲苯/丙酮氧化活性，甲苯在215℃和丙酮在228℃分别实现了90%的矿化率。原位漫反射红外傅里叶变换光谱表明，氧空位和电子结构调制的Pt物种协同增强了丙酮/甲苯的活化，加速了甲苯的破环，并在Pt _q /Sn _q上实现了丙酮的彻底氧化：_三氧化_二铁。这项研究可以为微调催化过程至关重要的活性位点的结构提供潜在途径。