MTO reaction over SAPO-34 catalysts synthesized by different times of crystalization

Effect of crystalization time on the catalytic performance of SAPO-34 catalyst have been investigated in conversion of methanol to light olefins. SAPO-34 catalysts were synthesized by using different crystalization times at 190̊C. The prepared samples were characterized by XRD, SEM and FTIR techniques. The catalytic performance of the synthesized catalysts was tested in MTO reaction at 410°C and WHSV of 6.5 h-1. Time of crystallization were found out as the significant parameter for controlling crystallinity and purity, particle size, morphology and content of hydroxyl groups of the product. all the samples showed cubic morphology and according to the XRD, the sample prepared at 463 K and 24h possessed the best crystallinity with the optimum crystal size. In the methanol conversion to olefins over SAPO-34 catalysts, this sample showed highest yield of light olefins (81.5 %wt) in 100% methanol conversion

Keywords:

MTO reaction , Light olefin , SAPO-34 , Crystalization time