Rapid synthesis of Cu SAPO 34 zeolite and MTO catalytic performance

Key words:  methanel to olefin  Cu-SAPO-34 molecular sieve  rapid synthesis  copper zeolite seed

Abstract:

Cu-SAPO-34 molecular sieves were rapidly synthesized with introduced copper zeolite seed as copper source for 10 h, which were compared with the traditional hydrothermal synthesis method and copper amine complex introduced copper source. Meanwhile, the structure and methanel to olefin (MTO) catalytic performance of the sample were characterized by XRD, SEM, IR, TPD and micro reaction. The results show that the Cu-SAPO-34 molecular sieve with a crystallinity of 86.24% and solid yield of 94.65% could be prepared by rapid synthesis method in 10 h, and the sum of ethylene and propylene selectivity reaches 81.26%. Compared with the addition of copper amine complex, the introduction of copper by adding copper seed is more suitable for rapid synthesis and avoids the problem that copper cannot combine with molecular sieve framework. Nanosized Cu-SAPO-34 molecular sieves with grain diameter of 470 nm could be rapidly synthesized by adjusting the properties and adding amount of Cu-SAPO-34 seed, in which the solid yield is 96.72%, and the ethylene and propylene selectivity is 86.24%.