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/cm2 and 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.
YANG Mingxia,FAN Senqing,CHEN Jiaojiao et al. Preparation of Flow-Through MnO2@Ti Electrocatalytic Membrane and Its Catalytic Performance for Oxidation of n-Propanol[J]. Chemical Reaction Engineering and Technology, 2023, 39(5): 385-393.
