Synthesis of stacked spherical hierarchical SAPO-34 zeolite and its methanol to olefin catalytic performance

Abstract

In this paper, stacked spherical hierarchical SAPO-34 zeolite was synthesized by hydrothermal crystallization with tetraethylammonium hydroxide (TEAOH) and morpholine (MOR) as composite template by adding cetyltrimethylammonium bromide (CTAB) as mesoporogen and crystal growth inhibitor. The effects of different templates and CTAB amount on SAPO-34 zeolite was investigated by XRD, SEM, NH3-TPD, and BET. The results showed that hierarchical SAPO-34 zeolite with high MTO catalytic performance was synthesized. With the increase amount of CTAB, the morphology of SAPO-34 zeolite changed from cubic to stacked spherical. Furthermore, the use of composite template could also greatly reduce the synthesis cost of SAPO-34 zeolite, which was of significance for its industrial development.