The self-inhibition behavior due to CO poisoning on Pt metal particles strongly impairs the performance of CO oxidation. It is an effective method to use reducible metal oxides for supporting Pt metal particles to avoid self-inhibition and to improve catalytic performance. In this work, we used in situ reductions of chloroplatinic acid on commercial Fe₃O₄ powder to prepare heterogeneousstructured Pt/Fe₃O₄ catalysts in the solution of ethylene glycol. The heterogeneous Pt/Fe₃O₄ catalysts achieved a better catalytic performance of CO oxidation compared with the Fe₃O₄ powder. The temperatures of 50% and 90% CO conversion were achieved above 260°C and 290°C at Pt/Fe₃O₄, respectively. However, they are accomplished on Fe₃O₄ at temperatures higher than 310°C. XRD, XPS, and H2-TPR results confirmed that the metallic Pt atoms have a strong synergistic interaction with the Fe₃O₄ supports. TGA results and transient DRIFTS results proved that the Pt metal particles facilitate the release of lattice oxygen and the formation of oxygen vacancies on Fe₃O₄. The combined results of O₂-TPD and DRIFTS indicated that the activation step of oxygen molecules at surface oxygen vacancies could potentially be the rate-determining step of the catalytic CO oxidation at Pt/ Fe₃O₄ catalysts. The reaction pathway involves a Pt-assisted Mars-van Krevelen (MvK) mechanism.

由于CO在Pt金属颗粒上的中毒导致的自抑制行为极大地损害了CO氧化的性能。使用可还原的金属氧化物来负载Pt金属颗粒是避免自抑制并提高催化性能的有效方法。在这项工作中，我们使用在商业Fe ₃ O ₄粉末上原位还原氯铂酸，以在乙二醇溶液中制备非均相结构的Pt / Fe ₃ O ₄催化剂。与Fe ₃ O ₄相比，非均相Pt / Fe ₃ O ₄催化剂具有更好的CO氧化催化性能。粉末。在Pt / Fe ₃ O _4下，分别在260°C和290°C以上分别达到50％和90％的CO转化温度。但是，它们是在高于310°C的温度下在Fe ₃ O ₄上完成的。XRD，XPS和H2-TPR结果证实，金属Pt原子与Fe ₃ O ₄载体具有很强的协同作用。TGA结果和瞬态DRIFTS结果证明Pt金属颗粒促进了晶格氧的释放和Fe ₃ O ₄上氧空位的形成。O ₂的综合结果-TPD和DRIFTS表明表面氧空位处的氧分子的活化步骤可能是在Pt / Fe ₃ O ₄催化剂上催化CO氧化的速率确定步骤。反应途径涉及Pt辅助的Mars-van Krevelen（MvK）机制。