Abstract
Core-shell structured hierarchical SSZ-13 microspheres with mesopore and zeolitic micropore were obtained via combining zeolite crystallization and post-synthesis fluoride etching. Secondary pores in core-shell SSZ-13 crystals were then formed by fluoride-containing chemical etching post-treatment routes. The samples were systematically characterized by XRD, SEM, N2 adsorption/desorption, and NH3-TPD measurements, indicating that the fluoride-treated SSZ-13 samples exhibit core-shell structure, high crystallinity, large specific surface area, and acidity. It is worth mentioning that the core-shell structured hierarchical SSZ-13 catalyst exhibited superior MTO catalytic performance with higher selectivity to ethylene and propylene as well as prolonged catalytic lifetime in comparison to the untreated SSZ-13.
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