Using Diatomite As Raw Material To Synthesize Waste Molecular Beta Sieve And Catalyzed Application

Cyclohexylbenzene is an important chemical product or intermediate,has a high boiling point and condensation point near room temperature, can be used as a high boiling point solvent and apenetrating agent; can be used for battery electrolyte additives for lithium ion two times; can improve the safety performance of the battery, also used in the synthesis of TFT liquid crystal materials etc.In addition, prepared by hydrogenation of phenol and cyclohexanone oxidation reaction of cyclohexyl benzene can provide the technological route,an alternative production of phenol acetone by-product, also does not exist the problem of excess.In this paper,the preparation and characterization of modified molecular sieves H-beta was investigated.,the gel composition, crystallization temperature, crystallization time on the synthesis of Beta were investigated too.Used as catalysts, they were applied to the synthesis of cyclohexylbenzene with benzene and cyclohexene by alkylation, and the effects of reaction conditions such as catalyst dosage, the molar ratio of benzene to cyclohexene, reaction temperature, and reaction time were examined. The results show that the catalysts modified with ammonium nitrate solution by ion-exchange twice exhibit the best catalytic activity,while the catalyst treated with same concentration organic acids reduced activity. The main reason is that a few framework aluminum changes into non-framework aluminum.Non-framework aluminum modified with aluminum ammonium nitrate residues in the channel of molecular sieve, while non-framework aluminum modified with organic acid was taken out of the channel of molecular sieve, which results in the decrease of acid.Used H-Beta modified with ammonium nitrate solution by ion-exchange twice as catalyst, the optimum technology conditions were achieved following as the molar ratio of benzene to cyclohexene was 20:1, catalyst dosage was 2%, temperature was 80℃, and reaction time was 4h. Under the optimum conditions, We also found that tricyclo [6.4.0.0(2,7)]dodecane occurred by the addition of cyclohexene molecule over the modified H-Beta catalysts.