Construction Of A Novel CuMn Bimetallic Oxide Catalyst And Its Catalytiv Performance For The Oxidation Of Cyclohexylbenzene

Phenol and cyclohexanone,as chemical raw materials with high added value,are mainly used in medicine,pesticide,rubber and other fields,and are mainly used in the synthesis of bisphenol A,phenolic resin,caprolactam and other fine chemicals.Phenol and cyclohexanone have high application value,so cyclohexylbenzene is oxidized to prepare hydrogen peroxide and cyclohexylbenzene is then acidly hydrolyzed into phenol and cyclohexanone,which has a good industrial application prospect.However,the liquid-phase oxidation of cyclohexylbenzene currently faces the problems of low catalytic efficiency and many by-products.Therefore,it is necessary to find a catalyst with high activity for catalyzing the oxidation of cyclohexylbenzene.In this paper,a novel CuMn-based composite metal oxide was constructed based on layered double metal hydroxides（LDHs）and carbon nanotubes（CNTs）.And based on the existing research results,a new CN-doped CuMncomposite metal oxide catalyst was prepared by adding melamine,the strong interaction between CN and CuMncomposite oxide was explored,and the performance of a series of Cu-based oxidation catalysts in the oxidation of cyclohexylbenzene was investigated.The specific research contents of this paper are as follows:（1）A series of CuMnAl-LDO/CNT catalysts with large specific surface area were prepared by co-precipitation method.The high dispersibility of the new CuMn-based composite metal oxide catalytic material exposes more active sites and builds a large number of Mn³⁺-O_v-Mn³⁺oxygen defect structure promotes the adsorption and activation of oxygen.The Cu-Mn intermetallic synergy enhances the reactivity.The catalyst does not need to add additional reaction assistants and solvents in the reaction process,thereby reducing the environmental pollution problem caused by the traditional technological process.（2）The ternary CuMnAl-LDH hydrotalcite precursor was prepared by the double-drop coprecipitation method,and the two were combined by thermal decomposition of CuMnAl-LDH and melamine in an inert atmosphere to prepare a new CN composite copper-manganese composite metal Oxide catalyst CuMnAl@CN.By adjusting the ratio between copper and manganese elements,a series of Cu-based oxidation catalytic materials are formed.The electron transport between the CN layer and the active metal increases the oxygen vacancy concentration,which is beneficial to the catalytic adsorption and activation of oxygen molecules.The CN layer and CuMncomposite oxide played a synergistic catalytic role,and achieved good performance in the liquid-phase oxidation of cyclohexylbenzene.The liquid phase oxidation of cyclohexyl benzene was carried out in an atmospheric bubbling reactor.Good experimental results were obtained by optimizing the reaction conditions.