Study On Preparation ,Characterization And Properties Of PtSn/SAPO-34 Catalysts

Propylene is an important basic chemical raw material,grows continuously.Propane dehydrogenation is an important process for producing propylene.At present,the bottleneck which restricts its application is the poor stability and low selectivityof catalyst.In this paper,SAPO-34 molecular sieve was used as catalyst carrier,Loading PtSn metal sapo-34 catalyst was obtained.Pick out a exccellent characrerization of catalast to propane dehydrogenation.A high purity SAPO-34 molecular sieve was synthesized according to the optimum material ratio.The sequential immersion method was used to load platinum and stannum.the optima content as follows:platinum content of 0.5wt%,stannum content of 1wt%.The synthesis catalyst was granulated using silica solution as binder.The optimum content of aluminum sol was 20wt%,the catalyst was the best in the fluidized state.The conversion of propane and selectivity to propene were 33%and94%respectively after reaction,which is superior to PtSn/Al₂O₃ catalyst.A series of experimental studies have been conducted on the reaction temperature?space velocityt?propane/hydrogen feed ratio.The optimal conditions were determined as follows:reduction temperature at 600??space velocity of5.6h-1,hydrogen/propane feed ratio of 0.25.The conversion of propane and selectivity to propene were optimum.On this basis,the optimal range of responses we selected was 13-24wt%.Research on the regeneration of inactivated catalysts.Hydrothermal regeneration and rchlorination conditions directly affect the regeneration reaction performance of catalysts.the optima content as follows:regeneration temperature at 500??regeneration time of 4h,rchlorination temperature at 500?.