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Y형 제올라이트의 탈알미늄과 그의 특성

The Preparation and Characterization of Dealuminated Y-type Zeolite

HWAHAK KONGHAK, April 1989, 27(2), 168-175(8), NONE
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Abstract

Y형 제올라이트를 높은 온도에서 SiCl4, 수중기 및 EDTA로 처리하여 일련의 탈알미늄화된 제올라이트를 만들었다. SiCl4로 탈알미늄화된 제올라이트는 수증기나 EDTA로 탈알미늄화된 것에 비하여 결정의 파괴없이 완전하였다. 그리고 탈알미늄화 제법에 관계없이 O-(Si, Al)-O 신축진동에 의한 적외선 흡수 밴드는 단위 세포당의 골격구조의 Al 원자수가 감소함에 따라 높은 파수족으로 이동하였다. 높은 파수 (3640cm-1)에 있는 수산기 밴드는 골격구조의 Si/Al비가 5이상에는 변화지 아니하였다. 탈알미늄화됨에 따라 제올라이트의 net 정전기적 하전의 감소 때문에 수분을 흡수하는 능력이 감소하였다.
A series of dealuminated Y-type-zeolites was prepared by treating zeolites with SiCl4, steam, and EDTA at elevated temperatures. Y-type zeolites can be dealuminated by reaction with SiCl4 without collapse of the crystal structure as compared with the treatment of steam and EDTA. Regardless of preparation method, the infrared absorp-tion bands in frequency of the stretching O-(Si, Al)-O vibrations shifted in a linear manner as number almost linearly with an increasing Si/Al ratio of the zeolite, but beyond a ratio close to 5, the frequency remained virtually unchanged. Upon dealumination the ability of the zeolite to absorb water decreased due to the decrease of net electrostatic charge.

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