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Synthesis and Evaluation of Bulky Y‐Zeolites by Hydrothermal Hot‐Pressing Method
Author(s) -
Nakahira Atsushi,
Takezoe Shinichi,
Yamasaki Yuki,
Sasaki Yukichi,
Ikuhara Yuichi
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01721.x
Subject(s) - zeolite , microporous material , materials science , hydrothermal circulation , hot pressing , crystallite , chemical engineering , amorphous solid , transmission electron microscopy , hydrothermal synthesis , ceramic , microstructure , phase (matter) , grain boundary , mineralogy , composite material , metallurgy , nanotechnology , catalysis , crystallography , chemistry , organic chemistry , engineering
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.