The LaCo_0.94Pt_0.06O₃ catalyst is reduced under 5% H₂/Ar at different temperatures to get Pt/LaCoO₃ with high catalytic activity for soot oxidation. Transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer–Emmett–Teller method (BET), X-ray photoelectron spectroscopy (XPS), H₂-temperature programmed reduction (H₂-TPR), O₂-temperature programmed desorption (O₂-TPD) and thermogravimetric analysis (TGA) were used to study the physicochemical properties of the catalyst. SEM and TEM results indicate that Pt nanoparticles (<10 nm) are grown homogeneously on the surface of the LaCoO₃ matrix after in-situ reduction. XRD shows that the reduced catalyst has a high symmetrical structure. TGA results indicate that all reduced catalysts exhibit an excellent activity, especially the catalyst reduced at 350 °C (T₁₀ = 338 °C, T₅₀ = 393 °C, T₉₀ = 427 °C). And perovskite is the primary active component. According to XPS study, the high symmetrical structure benefits the mobility of oxygen vacancy, and Pt nanoparticles induce the oxygen vacancy to move to its adjacent situation, resulting in more adsorbed oxygen on the surface of the reduced catalyst and increasing the activity. The possible reaction principle is also proposed.

LaCo _0.94 Pt _0.06 O ₃催化剂在5% H ₂ /Ar、不同温度下还原得到具有高催化活性的Pt/LaCoO ₃烟灰氧化。透射电子显微镜 (TEM)、扫描电子显微镜 (SEM)、X 射线衍射 (XRD)、Brunauer-Emmett-Teller 法 (BET)、X 射线光电子能谱 (XPS)、H ₂ -程序升温还原 (H ₂ -TPR ), O ₂ -程序升温脱附 (O ₂-TPD）和热重分析（TGA）用于研究催化剂的物理化学性质。SEM和TEM结果表明，原位还原后，Pt纳米颗粒（<10 nm）在LaCoO ₃基体表面均匀生长。XRD表明还原后的催化剂具有高度对称的结构。TGA结果表明，所有还原催化剂都表现出优异的活性，尤其是在350℃还原的催化剂（T ₁₀  = 338 °C，T ₅₀  = 393 °C，T ₉₀ = 427 °C）。而钙钛矿是主要的活性成分。XPS研究表明，高度对称的结构有利于氧空位的迁移，Pt纳米粒子诱导氧空位向其相邻位置移动，导致还原催化剂表面吸附更多的氧，从而提高活性。还提出了可能的反应原理。