Abstract
In this study, the syntheses of bulks of Y‐zeolite were attempted by a hydrothermal hot‐pressing (HHP) method with various conditions such as the amounts and concentrations of NaOH solution, reaction temperatures, and reaction times. Dense bulks of Y‐zeolite were successfully obtained by this HHP method. Under an optimum synthetic condition of HHP, solidified bulks of Y‐zeolite possessed translucency with high values of specific surface area. Transmission electron microscopy observation of these translucent bulks of Y‐zeolite showed that their microstructures were densified like polycrystalline ceramics sintered by heat treatments and no amorphous phase was observed at the boundaries of Y‐zeolite grains. As a result, in these unique bulks of Y‐zeolite synthesized by the HHP method, the microporous network was thoroughly connected at the grain boundaries of Y‐zeolite.
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