Preparation Of Ni-based Oxide Supported Electrocatalytic Film And Its Catalytic Performance

Achieving the selective oxidation reaction of C-H bonds with high efficiency and selectivity has always been one of the challenging problems in the field of chemistry and chemical research under mild conditions.The selective catalytic oxidation of benzene to phenol is of great significance both in the catalysis research and the industrial application of aromatic compounds.This work is based on electrocatalytic membrane technology,and uses conductive control Ti membrane as the substrate to achieve in-situ loading and morphological regulation of nanostructured catalysts.At room temperature and pressure,the selective catalytic oxidation of benzene to phenol can be achieved by optimizing the catalytic reaction system,providing new chemical,processes,and techniques for the selective oxidation.The main contents and conclusions are show below:?1?Hydrothermal method was used to control the morphology of 0D NiO nano-particles and 2D nano-sheet structures?NiO NPs/Ti,NiO NSs/Ti?for the catalytic applications.The results show that the catalytic activity of the electrocatalytic membrane electrode is significantly improved after the catalyst is supported;the NiO NSs/Ti electrode with a two-dimensional sheet structure exhibits high specific surface area and excellent electrochemical performance.Using NiO NSs/Ti electrocatalytic membrane as anode and stainless steel mesh as cathode,an electrocatalytic membrane reactor was constructed to catalyze the oxidation of benzyl alcohol.The results show that by optimizing the reaction system and membrane reactor parameters,the conversion of benzyl alcohol can reach>99%The selectivity of benzoic acid is>99%.Even at low temperature?0??,it has good catalytic results.The reason is that the two-dimensional sheet-like nanostructures can facilitate electron transfer and expose more catalytic activity sites.?2?Based on the work of Ni-based oxides,hydrothermal method was used to load Ni Co₂O₄ catalyst in situ on the inorganic Ti membrane substrate.The results of electrochemical performance test of Ni Co₂O₄ NPs/Ti membrane electrode show that compared with Co₃O₄ and NiO nanoparticle catalyst,the membrane electrode supported by Ni Co₂O₄ catalyst exhibits superior electrochemical performance,indicating that Ni Co₂O₄ can greatly improve the electrochemical performance of membrane electrode performance.?3?Based on the above,the morphology control of the Ni Co₂O₄ catalyst can be controlled to obtain three types of membrane electrodes:zero-dimensional Ni Co₂O₄NPs/Ti,one-dimensional Ni Co₂O₄ NNs/Ti and two-dimensional Ni Co₂O₄ NSs/Ti,electrochemical catalytic oxidation of benzene was performed.The results showed that the supported one-dimensional Ni Co₂O₄ NNs/Ti membrane electrode showed the best reaction results in the catalytic benzene oxidation reaction.Acetic acid and sodium acetate are used as the reaction system at 0?,the current is 1 m A,and the residence time is 10 min,the electrolyte concentration is 5 g/L,and the benzene concentration is 30 mmol/L,the conversion rate of benzene is 74.1%,and the selectivity of phenol is>99%.Selective oxidation of benzene was achieved under the present conditions.