In-situ crystallization of macroporous MFI-type zeolites
Macro-microporous silicate-1 zeolites(MFI crystalline form)were synthesized via the"dissolu-tion-recrystallization process",utilizing monodisperse silica spheres(500 nm)as the silica source and macroporous templates,as well as tetrapropylammonium hydroxide as the microporous template,to enable in-situ formation of the macropores.The samples displayed macropore diameters ranging between 150～350 nm,a specific surface area of 350 m2/g,and a total pore volume of 0.24 cm3/g.The influence of syn-thetic conditions,such as crystal time,the addition of ethanol,the drying method,the amount of structure directing agent and the size of silica spheres,on the introduction of macropores was revealed.On this ba-sis,macroporous ZSM-5 zeolites were further successfully synthesized with aluminum atoms incorporated into the pure silica zeolite framework.
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