Study On Catalytic Oxidation And Coupling Reaction Of Anderson Type Heteropoly Acid Catalyst

Selective oxidation and coupling reactions have always been two important and challenging topics in the field of chemistry.Traditional selective oxidation reactions often require the consumption of stoichiometry or a large amount of excessive oxidants in terms of oxidants,the price is high,and many oxidants have a certain degree of toxicity,some reactions will also produce stoichiometry or a large number of waste acids and waste metal salts,which will lead to and aggravate environmental pollution.People gradually to the attention of the environmental pollution problem,because many organic oxidants are difficult to recycle,and serious pollution,people tend to be more and more use of air,oxygen,hydrogen peroxide,such as very green oxidant,but these oxidants relative to the oxidation of certain organic and inorganic oxidants oxidant is weaker,often requires a catalyst to promote or regulating the reaction selectivity,therefore the development of green,efficient,high selectivity of catalyst is the most important research direction in the field of catalysis.In recent decades,metal/organic ligand catalysts have made great progress in selective oxidation,oxidation coupling,etc.,but they have some problems in catalytic oxidation,such as poor stability,difficulty in recycling and unfriendly environment.In contrast,heteropoly acid catalyst is a kind of green catalyst with advantages,which has good stability and can regulate the REDOX property without changing the original configuration through different element composition.Development of polymetallic oxalates is more and more quickly,because of its abundant structures and properties are used in many catalytic reaction,the Anderson model structure of heteropoly acid,with relatively simple structure,small molecular weight,active site is clear,and can change its REDOX properties through organic modification,although now in catalysis research reported to date,but has a very broad prospects.Based on the literature reports and the research results of our research group,this paper mainly explores the application of Anderson type heteropoly acid catalyst in the oxidation reaction and coupling reaction,which is mainly divided into the following two parts:(1)the Anderson type polymetallic oxonate with Fe as the center is applied in methylene oxidation to generate ketones.(2)the Anderson type metal oxonate with Cu as the center is applied in the coupling of amine compounds and boric acid compounds to generate secondary amine compounds.Our research is based on mild green oxidants such as air,oxygen or hydrogen peroxide,polymetallic oxalate catalysts with excellent catalytic activity and stability,the synthesized polyacids were characterized by XRD,FT-IR.Polymetallic oxalate catalysts can also be reused and simply recycled.In addition,the catalytic mechanism of the catalyst was simply predicted by control experiments.