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Synthesis of hierarchical MFI zeolites with a micro-macroporous core@mesoporous shell structure.

Core-shell structured ZSM-5 zeolites (CSSZs) consisting of a micro-macroporous zeolite core and a mesoporous zeolite shell were synthesized by using a bifunctional surfactant containing an alkene group in the hydrophobic tail. The alkene tail and aluminum concentration are the key factors for the formation of the mesoporous shell in CSSZs.