A few days ago, the reporter learned from the Institute of Process Engineering, Chinese Academy of Sciences that the team of researchers Su Fabing and the team of Gong Xueqing, a professor at East China University of Science and Technology, worked to further deposit ZnO nanoparticles on the basis of the previous work basis of exposing specific crystal planes of submicron Cu2O crystals On the crystal, a ZnO / Cu2O nanocomposite with a rich PN heterostructure was synthesized and used as a model catalytic system for the Rojo reaction. At the molecular atomic level, the interface synergy mechanism of Cu2O and ZnO was revealed. The results were published in the Journal of Catalysis. Because of the combination of the inorganic properties of silicon and the performance of organic materials, silicone materials are widely used in many fields of social production and life, such as aerospace, construction, electrical and electronic, textile, automotive, machinery, chemical and light industry, metal and Paint, medicine and medical treatment. Dimethyldichlorosilane (M2), as the monomer raw material with the largest amount of synthetic silicone material, is industrially produced by methyl chloride and silicon powder under the action of copper-based catalytic materials, that is, by Eugene G in the 1940s . Rochow invented Rocho reaction. However, while M2 is obtained in this reaction, a large amount of by-products (about 15% to 20% of the product content) will also be produced. Therefore, improving the selectivity and yield of M2 has always been a long-term concern of the industrial and academic circles. Hotspots and difficulties. Although existing research has found that the addition of Zn-based additives to copper-based catalysts can improve the selectivity and yield of M2, and Zn powder is also used in industry as a co-catalyst, but due to the complexity of the reaction itself and the catalyst structure The cooperative catalytic mechanism is still unclear. This study found that ZnO / Cu2O nanocomposites showed higher M2 selectivity and yield than single submicron Cu2O crystals with specific crystal planes exposed. Among them, ZnO / Cu2O {100} composites have the largest improvement, Compared with ZnO / Cu2O {111} and ZnO / Cu2O {110} composites, ZnO / Cu2O {100} composites have the highest M2 selectivity and yield. Theoretical calculations show that the PN interface structure formed by ZnO and Cu2O {100} enhances the transfer ability of valence electrons from Cu2O to ZnO, making the Cu2O surface more positively charged, which is conducive to the dissociative adsorption of the reactant monochloromethane, thereby promoting The generation of active copper atoms and the formation of CuxSi active phase. The researchers say that this work not only reveals the synergistic mechanism of Cu / Zn main-cocatalyst at the microscopic scale, but also provides a strategy to improve the selectivity of the reaction by regulating the heterogeneous interface structure, which is helpful for the new copper-based The development of catalysts and the regulation and control of industrial main promoters. (Reporter Zhang Siwei) Poly Bag,Poly Garment Bags,Plain Clear Poly Bag,Clear Poly Bag Shaoxing Jiandong Metalware Co.,Ltd. , https://www.laundry-jd.com