ZSM-5 zeolite nanosheets with b-axis thickness ranging from 50 nm to 200 nm are synthesized through using a protozeolite seed suspension induction strategy,with inexpensive silica sol and aluminum sulfate as silicon and aluminum sources,respectively,tetrapropylammonium hydroxide(TPAOH)as a template agent,and ammonium fluoride as a crystal growth regulator.The influences of the type and dosage of protozeolite seed suspension as well as the addition quantity of ammonium fluoride on the morphology of the nanosheets are investigated.Results show that protozeolite seed suspension with evident MFI crystal characteristics is less effective in inducing the formation of ZSM-5 nanosheets,whereas those without MFI characteristics can effectively induce the synthesis of ZSM-5 nanosheets.The particle size of the colloid in protozeolite seed suspension impacts significantly the size of the synthesized nanosheets,larger colloidal particles result in larger nanosheets.The c-axis of the nanosheets gradually lengthens with the addition of ammonium fluoride,while the b-axis gradually shortens with an increasing dosage of protozeolite seed suspension.Through optimizing the dosage of protozeolite seed suspension and ammonium fluoride,ZSM-5 nanosheets with different axial lengths can be synthesized.
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