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J. Korean Ceram. Soc. > Volume 31(12); 1994 > Article
Journal of the Korean Ceramic Society 1994;31(12): 1570.
천연 Mordenite로부터 X-형 제올라이트 합성에 관한 연구
이미재, 조재훈1, 허혜경, 최병현
요업기술원
1경희대 화학공학과
Studies on Synthesis of X-type Zeolite from the Natural Mordenite
ABSTRACT
Effect of Na2O/SiO2 molar ratio, calcining temperature and addition of NaCl were investigated on the hydrothermal formation of X-type zeolite from the natural mordenite, which is a kind of rock deposited abundantly in kuryong po. Pulverized mordenite was first mixed with NaOH or NaOH-NaCl solution, and crystallized under hydrothermal condition at 90~10$0^{circ}C$ for 10 hrs. Optimum condition for synthesis of the X-type zeolite were circled1 the ratio Na2O/SiO2, NaCl/Al2O3 and H2O/Na2O:0.68, 11.4 and 40, respectively, circled2 calcining temperature of starting materials: 90$0^{circ}C$, circled3 aging time: 48 hrs. and circled4 crystallization temperature: 10$0^{circ}C$. The yield of X-type zeolite under the optimum condition was about 55~60%, and the major crystallized X-type zeolite was faujasite phase. Zeolite of then type X was crystallized when NaCl was added to treating solution with in the limit 14.25 of NaCl/Al2O3 molar ratio. As the calcination temperature (from 50$0^{circ}C$ to 95$0^{circ}C$) of starting materials increases, yield of zeolite x increase.
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