Affecting the Formation of the Micro-structure and Meso/macro-structure of SAPO-34 zeolite by Amphipathic Molecules

SAPO-34 is an important member in the family of zeolites, which shows excellent catalytic activity in MTO reaction, but suffers from the diffusion bottleneck. To overcome the diffusion problem, porogen was added to generate meso/macro pores in SAPO-34 zeolite. In this work, amphipathic molecules were designed as CSDA to synthesize a tri-level hierarchically porous SAPO-34, and the introduction of CSDA could promote the Si atoms incorporating into the AlPO(4)framework, change the morphology of particles and decrease the acidity of prepared SAPO-34 zeolite. The prepared SAPO-34 catalyst exhibits higher selectivity of C(2)H(4)and C(3)H(6)in the MTO reaction than the conventional SAPO-34 zeolite. The morphology and the microstructure of the prepared samples vary with the carbon chain of the amphipathic molecules due to the matching between amphipathic molecules and topological structure of CHA.