Effect of Crystallization Temperature on the Synthesis of SAPO-34 and its Catalytic Performance in MTO Reaction

The effect of different crystallization temperatures on the crystallinity, morphology, surface area and catalytic performance of SAPO-34 has been investigated. SAPO-34 catalysts were successfully synthesized using the conventional hydrothermal method. The prepared samples were characterized by XRD, SEM, BET 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. Temperature of crystallization was found to be the significant parameter for controlling crystallinity and purity, particle size, morphology, surface area and content of hydroxyl groups of the product. The sample prepared at 463 K and 24h possessed the best crystallinity with the smallest crystal size. In the methanol conversion to olefins over SAPO-34 catalysts, this sample showed highest yield of light olefins (88 wt%).