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Silicalite-1 membranes supported on macroporous Al2O3 tubes were prepared by in-situ crystallization and secondary growth method under microwave-assisted closed system. The influences of crystallization time and temperature on properties of the as-prepared membranes were investigated. Results show that by in-situ crystallization at different temperatures it’s hardly to obtain uniform membranes on the poor supports, while by secondary growth method dense and well-intergrown silicalite-1 membranes with thickness of 2 μm on seeded supports can be obtained even at 393 K for 60 min. At 423 K, 30 min was enough to synthesize well-intergrown and uniform zeolite membrane under microwave heating. These silicalite-1 membranes also exhibit well hydrogen permeation performance. The effect of temperature was more remarkable than that of time evaluated from the morphology difference of these membranes.
Silicalite-1 membranes supported on macroporous Al2O3 tubes were prepared by in-situ crystallization and secondary growth method under microwave-assisted closed system. The influences of crystallization time and temperature on properties of the as-prepared membranes were investigated. Results show that by in -situ crystallization at different temperatures it’s hardly to obtain uniform membranes on the poor supports, while by secondary growth method dense and well-intergrown silicalite-1 membranes with thickness of 2 μm on seeded supports can be obtained even at 393 K for 60 min. The silicalite-1 membranes also exhibit well hydrogen permeation performance. The effect of temperature was more remarkable than that of time as from from morphology. Of at 423 K, 30 min was enough to synthesize well-intergrown and uniform zeolite membrane under microwave heating. these membranes.