Intermetallic compounds are a kind of important materials in heterogeneous catalysis. In this work, we first synthesized the PtMn_y intermetallic nanocrystals using the polyvinyl pyrrolidone-assisted ethylene glycol reduction method, and then loaded them on the surface of mesoporous CeO₂ (meso-CeO₂) derived from a KIT-6-templating route, generating the mPt―nMnO_x/meso-CeO₂ (m = 0―0.39 wt%, n = 0―1.21 wt%) catalysts after calcination at 500 °C in air. It is found that the as-obtained catalysts displayed an ordered mesoporous architecture with surface areas of 95―108 m²/g. The 0.37Pt―0.16MnO_x/meso-CeO₂ sample exhibited the best catalytic performance for toluene combustion (T_50% =162 °C and T_90% =171 °C at space velocity = 40,000 mL/(g h)). Kinetic analysis reveals that the apparent activation energy (57 kJ/mol) obtained over the best-performing 0.37Pt―0.16MnO_x/meso-CeO₂ sample was lower than those (63―75 kJ/mol) obtained over the other samples. Furthermore, the 0.37Pt―0.16MnO_x/meso-CeO₂ sample possessed good thermal stability and water-resistant performance. Benzyl alcohol, benzoic acid, and maleic anhydride were proven to be the main intermediates of toluene combustion, hence, toluene combustion might take place through a sequence of toluene → benzyl alcohol and benzoic acid → maleic anhydride → carbon dioxide and water, which might obey the Eley―Rideal reaction mechanism. It is concluded that loading of Pt and MnO_x enhanced the adsorbed oxygen and Mn²⁺ species concentration and low-temperature reducibility, thus promoting toluene combustion over 0.37Pt―0.16MnO_x/meso-CeO₂.

金属间化合物是非均相催化中的一种重要物质。在这项工作中，我们首先使用聚乙烯吡咯烷酮辅助的乙二醇还原法合成了PtMn _y金属间纳米晶体，然后将其负载在源自KIT-6模板路线的介孔CeO ₂（meso-CeO ₂）的表面， 在空气中500°C煅烧后生成m Pt- n MnO _x / meso-CeO ₂（m  = 0-0.39 wt％，n = 0-1.21 wt％）催化剂。发现所获得的催化剂表现出有序的介孔结构，表面积为95-108 m ^2。/G。0.37Pt-0.16MnO _x / meso-CeO ₂样品表现出最佳的甲苯燃烧催化性能（在空速= 40,000 mL /（gh）时，T _50％ = 162°C和T _90％ = 171°C）。动力学分析表明，在性能最佳的0.37Pt-0.16MnO _x / meso-CeO ₂样品上获得的表观活化能（57 kJ / mol）低于在其他样品上获得的表观活化能（63-75 kJ / mol）。此外，0.37Pt〜0.16MnO _x / meso-CeO ₂样品具有良好的热稳定性和防水性能。苯甲醇，苯甲酸和马来酸酐被证明是甲苯燃烧的主要中间体，因此，甲苯燃烧可能通过甲苯→苯甲醇和苯甲酸→马来酸酐→二氧化碳和水的顺序发生。 Eley-Rideal反应机理。结论：负载Pt和MnO _x可以提高吸附氧和Mn ^2+的浓度，降低低温还原性，从而促进甲苯燃烧超过0.37Pt〜0.16MnO _x / meso-CeO ₂。