Modified seeding method for preparing hierarchical nanocrystalline ZSM-5 catalysts for methanol aromatisation

• Hierarchical nanocrystalline ZSM-5 were prepared for methanol aromatization.
• Adding PATMOS effectively decreased crystal size and introduced mesoporous.
• Small crystal size and plenty of mesoporous will extend the catalytic life notably.

A series of ZSM-5 nanozeolites with hierarchical porosity were prepared by a seeding method and the addition of phenylaminopropyltrimethoxysilane (PATMOS) into the medial synthesis system. The influence of the amounts of PATMOS on the pore characteristics, crystallinity, morphology and acidity of the ZSM-5 zeolites were studied by XRD, N2-adsorption, 27Al MAS NMR, SEM, TEM and NH3-TPD. The crystal size of the ZSM-5 zeolites could be adjusted in a certain range, and the mesopores were generated by introducing PATMOS. In addition, the catalytic performances of the hierarchical nanocrystalline ZSM-5 were investigated for methanol aromatisation (MTA). The hierarchical nanocrystalline ZSM-5 catalysts with a small crystal size and numerous mesopores exhibited high stability for the MTA reaction due to an enhanced mass transfer property and reduced diffusion limitations.

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