▎ 摘　　要

NOVELTY - Preparation of modified MFI-type molecular sieve, where molecular sieve is ZSM-5, comprises taking graphene, dissolving in 1-2 L deionized water, adding ammonia water to adjust pH of the solution at 7-8, ultrasonically dispersing with an ultrasonic cleaner to form brown sol suspension until there is no graphene particles to obtain graphene suspension, mixing silicon source, aluminum source, tetrapropylammonium hydroxide (TPAOH) and distilled water by stirring at room temperature, adding graphene suspension, mixing uniformly to obtain crystal gel precursor, where the mass ratio of graphene and silicon source is 1-10 mass%, placing in a hydrothermal reaction kettle, under crystallization temperature, conducting crystallization reaction to obtain crystallized product, centrifuging, washing,drying and roasting. USE - The method is for preparation of modified MFI-type molecular sieve. ADVANTAGE - The method improves the diffusion property of porous ZSM-5 molecular sieve.