Conversion Of MCM-41 And Its Application In The Catalytic Benzene To Phenol

One-step hydroxylation of benzene to phenol has been a challenging subject in organic synthesis. Phenol is an important intermediate in organic synthesis, mainly for the production of bisphenol A(isopropylidene diphenol) and the phenolic resin and also is used in the production of aniline, caprolactam, phenol, salicylic acid, fatty acids, etc., and in pharmaceuticals, pesticides, synthetic rubber, plastics, dyes, perfumes and paint also has a wide range of applications.Research of improving the yield of phenol under mild conditions has great significance for the promotion of phenol production. Currently phenol mainly produced by the cumene phenol method, this process requires the presence of three-step reaction, but the multi-product is acetone, it causes serious environmental pollution and other issues. People pay more attention to how to improve the utilization of atomic chemical synthesis reactions, and use the catalyst instead of reaction reagents. They hope to save resources and reduce environmental pollution. Introducing hydroxyl into the benzene ring through activated aromatic ring C-H bond and achieving direct functionalization of aromatics is currently one of the challenging subjects. Direct oxidation of benzene with hydrogen peroxide to phenol the byproduct is water, also has a short course, high atom economy, no pollution, etc., and therefore has been considered the most promising to be a green cumene production methods. In order to achieve this purpose, the selection and preparation of the catalyst has become one of the most crucial factors. So Looking for the catalysts whose materials are cheap and readily available and their preparation process are simple and can be used repeatedly, easy to recycle is the most important factor in this research.The MCM-41 immobilized with Schiff base and the MCM-41 immobilized with metal salt has been reported as the most representative one-dimensional hexagonal channel, MCM-41 compared with other zeolites has larger pore size, higher surface area, the smaller diffusion resistance, high mechanical strength, good stability, acid and alkali, at the same time cost lower, long life and other characteristics. So it has many potential applications in many areas of catalysis, such as adsorption, separation, optical, electrical, magnetic, etc. Due to its large specific surface area, pore structure and rule rich inner surface hydroxyl groups, it can load metal ions, metal oxides, organic molecules, heteropoly acids, amines, and modify the synthesis of metal complexes, to complete the modification and functionalization of MCM-41 in order to achieve a more efficient catalytic performance and a wider range of application purposes. In this article, using hydrogen peroxide as an oxygen source, multi-heterocyclic Schiff base-modified mesoporous MCM-41 and NaVO3 catalyse hydroxylation of benzene to phenol.The thesis includes two major parts:The first part is about literature review, introduce the research progress of one step benzene to phenol with hydrogen peroxide as the green oxidant, and the development and application of modification of mesoporous molecular sieve MCM-41 were reviewed. In addition, this part introduces the progress of hydroxylation of benzene to phenol.The second part is about experiment content. It introduced the major work:1. The mesoporous molecular sieves MCM-41 ware functionalized with Schiff base and to prepare the catalyst of mesoporous molecular sieve immobilized copper and vanadium, then characterized by XRD, FT-IR, TG, SEM, BET, EDS.2. Study of the reaction of one pot oxidation of benzene to phenol catalyzed by functional MCM-41-metal salts and mesoporous molecular sieve immobilized copper and vanadium.