Shape-preserving transformation of monolithic porous glass into MFI-type zeolite

Shape-preserving transformations of porous glass monoliths into MFI-type zeolites by hydrothermal treatments in presence of triisopropyl ammonium bromide and triisopropyl ammonium hydroxide are described. Complete transformations were enabled by addition of a second silicon source to the synthesis solution, here colloidal silica. The impact of parameters such as the pore size and pore-wall thickness of the employed porous glass monoliths, the molar composition of the synthesis solution and the synthesis time on the synthesis product is elucidated.

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► Transformations of porous glass monoliths into MFI-type zeolite by hydrothermal treatments.
► Enabled by addition of colloidal silica to the synthesis solution.
► Initial formation of MFI layers.
► Subsequent growth of MFI crystals inside.
► Interconnected MFI crystals surrounded by macropores.