Synthesis and catalytic performance of high selectivity of SAPO-34 molecular sieve

A SAPO-34 molecular sieve with the CHA framework was synthesized by a hydrothermal method using aluminum phosphate as the source of aluminum and phosphorus,and characterized by XRD,BET,NH3-TPD and SEM techniques.The catalytic performance of the molecular sieve was experimentally evaluated by taking methanol-to-olefins(MTO) as a model reaction in a fixed-bed reactor.The results showed that the molecular sieve only generated ethylene in the MTO reaction and the selectivity to ethylene was over 90%.Furthermore,the molecular sieve was found to have good regenerativity(or thermostability).Compared with SAPO-34 molecular sieves prepared by conventional methods,our product has a better catalytic performance,and thus it has good prospects for industrial application.