无氯苯甲醛在医药、香料等行业广泛使用，可通过苯甲醇氧化法绿色制备，但目前存在产率低和选择性差等缺陷。本项目拟设计和制备一种“Sandwich-Janus"耦合结构纳米复合膜对苯甲醇进行催化氧化以克服上述缺陷。纳米复合膜由中间负载纳米金属催化剂的双亲性芯层和一个强亲水层一个强亲油层组成，同时具有“Sandwich”结构与“Janus”膜结构性能特性。反应时，有机相苯甲醇和水相双氧水快速渗透到双亲性中间芯层，通过调控中间芯层组成和微结构，可以构建大量负载金属粒子的表面和油-水界面，提高苯甲醇和双氧水反应速率。反应完成后，生成的亲油性苯甲醛可及时通过中间芯层回到油相，与双氧水自动分离，避免进一步被氧化，从而提高生成苯甲醛的选择性。本研究为苯甲醛绿色制备产业化升级提供新的思路，同时为液-液界面反应提供新的理论和实践基础，具有重要意义。

Benzaldehyde is widely used in pharmaceutical, perfumery industries. Benzaldehyde can be synthesized by benzene methanol oxidation reaction. However, this method exists key drawbacks of low production rate and poor selectivity, which greatly limit the widely used in perfumery and medical field. This project plans to construct and prepare one kind of “Sandwich-Janus" structured nanocomposite membrane to accelerate the liquid phase oxidation rate at benzene methanol-hydrogen peroxide interface and enhance the yield of and selectivity to benzaldehyde. The Sandwich structured nanocomposite membrane is composed by amphiphilic core and hydrophilic/hydrophobic shell. The properties of the nanocomposite membrane shell are opposite. One side is hydrophobic and the other side is hydrophilic, which is called Janus membrane. The highly active and selective metal nanocatalysts are loaded in the amphiphilic core of nanocomposite membrane. The benzene methanol and hydrogen peroxide can permeate to amphiphilic district through hydrophobic and hydrophilic surface respectively and then they would quickly react in the pores of nanocomposite membrane and the product benzaldehyde also can be selectively transported to the hydrophobic surface, allowing the increasing of reaction rate and selectivity at the same time. This method may provide a new route and idea for industrial upgrading of green preparation of benzaldehyde and a new theoretical and practical basis of Liquid-Liquid interface reaction.