Abstract
Ordered mesoporous carbon–silica composite was “in situ” transformed into hierarchically porous zeolites ZSM-5 (H-ZSM-5) under water vapor, which synthesized from evaporation induced “tri-constituent” co-assembly of resin, silica and surfactant. The vapor assisted transformation was realized within 2-D hexagonally mesochannels of carbon–silica composite infused with tetrapropylammonium hydroxide at 130 °C for 72 h. The calcined H-ZSM-5-570 possesses a mesostructure with mean pore sizes of 0.6 and 9.0 nm, BET surface area of 409 cm 2/g, and pore volume of 0.54 cm 3/g. High-resolution TEM images of H-ZSM-5-570 display that mesoporous walls consisted of zeolite nanocrystals of about 6 nm in the same domain. Weak acidity of H-ZSM-5-570 has also been concluded from ammonia desorption measurements.
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