ZSM-5 nanocrystalline aggregates zeolites with hierarchical pores are synthesized by means of the nanoparticles self-assembly strategy,using tetrapropyl ammonium hydroxide(TPAOH)as the single template and cheap silica sol as silicon source.The effects of SiO2/Al2 O3 ratio and the contents of Na+on the morphology of ZSM-5nanocrystalline aggregates zeolites are investigated.The formation process of nanocrystalline aggregates is tracked at different crystallization times.The properties of the synthesized molecular sieve are analyzed by means of XRD,SEM,nitrogen adsorption/desorption and other characterization measurements.The results show that the lower SiO2/Al2O3 ratio is conducive to the formation of molecular sieve of nanocrystalline aggregates,and Na+in the synthetic system plays an important role in the formation of the aggregates.After the optimization and regulation,ZSM-5 nanocrystalline aggregates with a solid yield of 94.2％can be synthesized in the pilot test.The product with high crystallinity and high yield can be successfully synthesized by a 3-L synthesis reactor with a 40-fold amplification.
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