Benzyl Alcohol Oxidation To Benzaldehyde Over Manganese Oxide Octahedral Molecular Sieves Supported Noble Metal And Its Concept Design

Benzaldehyde is an important chemical raw material for producing lauric acid, phenylacetaldehyde, lauric aldehyde and benzyl benzoate, and also can be used in the production of pharmaceuticals, dyes intermediates, food additives and so on.There are two traditional methods for producingbenzaldehyde. One ishydrolysis of dichloro benzyl, and the other is direct oxidation of toluene. In the formermethod, dichloro benzyl is obtained by chlorination of toluene,andbenzaldehyde is obtained by hydrolysis while by-product benzoic acid is formed. The product of benzaldehyde containing chlorine is difficultly used in the food, flavor, etc. In the latter method, the main product is benzoic acidwhile benzene formaldehyde is just a byproduct. From the perspective of green catalysis, these two kinds of production processes have their own disadvantages.With the continuous development and the increasing emergence ofnew catalytic materials,the application of manganese oxide octahedral molecular sieves, nano noble metalsuch as nano gold, nano palladium and nano silverin selective oxidation has been paid more and more attention. Therefore, in view of the problems existing in the technology for producing benzaldehyde,this paper proposed studies of OMS-2 supported nano noble metal catalysts for benzylalcohol oxidation to benzaldehyde and its process concept design.The research contents and conclusions are as follows:In this paper, technology for benzylalcohol oxidation to benzaldehyde over OMS-2 supported nano noble metal catalysts was studied. It includes catalyst preparation, catalytic performance evaluation, and catalyst characterization.Benzyl alcohol conversion 48.5% and selectivity of benzene formaldehyde 80.1% were obtained under the better reaction conditions which were as follows:the reaction temperature is 120℃, the reaction time is 6h, the catalyst dosage is 0.06gcatalyst/g benzyl alcoholl, and oxygen pressure is 0.5 MPa.Catalyst characterization through XRD, SEM-EDS showed that the palladium gold had been loaded on the support, and the support structure was OMS-2.Concept design of the heterogeneous catalytic process of benzyl alcohol oxidation into benzaldehyde over self developed OMS-2 supported palladium-gold catalyst was studied. Its design capacity is annual 1000 tonsformaldehydecontaining no chlorine. The design results showed that the technology not only is feasible, but also will obtain good economic benefits.Through the study of this paper,a process software package was provided for benzyl alcoholoxidation to benzaldehyde multiphase catalytic. The processproduct benzaldehyde does not contain chlorine, and the atomic economyof the oxidation reaction is improved, which is of important academic value and industrial application potential. Therefore,the process software packagewill provide extremely valuable information for its industrializationin the future.