【摘要】 为了增强催化剂和反应物之间的接触和传质，采用流动合成法在多孔钛膜孔道中原位固载了MnO₂纳米颗粒，构筑了MnO₂@Ti电催化膜，并用于电催化正丙醇氧化制备丙酸。形貌结构表征表明在1μm膜孔中成功地固定了平均尺寸为83 nm的MnO₂纳米颗粒。电化学表征表明，与钛膜相比，MnO₂@Ti电催化膜的电流密度增加了3.58 mA/cm²，电荷转移电阻降低了26.1Ω，说明可以实现更快的电子转移。MnO₂@Ti电催化膜在膜通量为89.3 L/（m²·h）的穿流模式下，催化初始浓度为160 mmol/L的正丙醇氧化的转化率可达95%，丙酸选择性为89%，丙酸电流效率为90%。正丙醇氧化生成丙酸反应的机理分析表明，穿流模式下强化接触和传质能使MnO₂@Ti电催化膜氧化过程中更多的·OH被利用，从而提高正丙醇的氧化性能。更多还原

【Abstract】 To enhance the contact and mass transfer between catalyst and reactants, MnO₂@Ti electrocatalytic membrane was fabricated by flowing synthesis with MnO₂ nanoparticles in situ immobilized in the pores of porous Ti membrane, and used for the production of propionic acid by electrocatalytic oxidation of n-propanol. The morphological and structural characterization showed that MnO₂ nanoparticles with an average size of 83 nm were successfully immobilized in 1 μm membrane pores. The electrochemical characterization showed that the current density of the electrocatalytic membrane increased by 3.58 mA/cm²and the charge transfer resistance decreased by 26.1 Ω compared to Ti membrane via flow-through mode,which indicated that faster electron transfer could be achieved. During the process of n-propanol oxidation by MnO₂@Ti electrocatalytic membrane via flow-through mode with a membrane flux of 89.3 L/（m²·h）, the conversion of n-propanol with initial concentration of 160 mmol/L could reach 95%, the selectivity of propionic acid was 89% and the current efficiency of propionic acid was 90%. The mechanism analysis of n-propanol oxidation to propionic acid showed that the enhanced contact and mass transfer via flow-through mode would allow more ·OH to be utilized in the oxidation process of MnO₂@Ti electrocatalytic membrane,thus enhancing the oxidation performance of n-propanol.更多还原