β-ユークリプタイトの生成過程に及ぼす前駆体ゼオライト構造の影響

概要

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Three kinds of zeolites with different crystal structures with the composition of Li_2O・Al_2O_3・2SiO_2・xH_2O were used as a precursor of β-eucryptite. The difference in the zeolite structures resulted in the difference in thermal-transformation processes to β-eucryptite from the zeolites. Li-A (BW) zeolite gave rise to the following thermal-transformation without the formation of a intermediated amorphous phase: Li-A (BW)→anhydrous ABW→γ-eucryptite→β-eucryptite. In Li-exchanged zeolite A, the zeolite structure decomposed at 720℃, and simultaneously formed mainly β-eucryptite, along with a small amount of γ-eycryptite. Li-exchanged Linde F zeolite became an amorphous material at 300℃, and then generates γ-eucryptite and β-eucryptite from the amorphous phase at 720℃. In all of Li type zeolites, a single phase of β-eucryptite was finally obtained by heating above 1000℃.
2009-04-10