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ZSM-5 제올라이트의 결정화 속도에 관한 연구
The Study on the Crystallization Rate of ZSM-5 Zeolite
HWAHAK KONGHAK, June 1992, 30(3), 285-291(7), NONE
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Abstract
묽은 알칼리성 실리케이트-알루미네이트 수용액에서 ZSM-5 제올라이트가 결정화되는 과정을 조사하였다. 150-195℃에서 결정화 곡선과 반응모액의 pH 변화를 조사하고 최종생성물의 결정크기 분포를 비교하였다. 유도기간 중에 생성된 핵심이 일정한 길이 성장속도로 성장하며 고형 반응물이 남아있는 동안에는 용해된 반응물의 농도가 일정하다고 가정하면, 적절한 속도상수를 대입하여 결정화 과정을 잘 모사할 수 있었다. 길이성장 속도상수는 150℃에서 0.009㎛ㆍmin-1, 175℃에서 0.038㎛ㆍmin-1, 195℃에서 0.092㎛ㆍmin-1로 얻어졌다.
Crystallization process of ZSM-5 zeolite from dilute silicate-aluminate solution was studied. Crys-tallization curves, pH change of reactant, and size distribution of final product were examined at 150-195℃. the crystallization curve can be simulated adopting optimum rate constant for linear growth, if the crystal is growing from nuclei formed during induction period with the constant growth, if the crystal is growing from nuclei formed during induction period with the constant growth rate and the fraction of soluble species is constant till all amorphous reactant is dissolved. The rate constants for linear growth are determined as 0.009㎛ㆍmin-1 at 150℃, 0.038㎛ㆍmin-1 at 175℃, and 0.092㎛ㆍmin-1 at 195℃.
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