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Cs이온교환된 제올라이트 A내 수소 Encapsulation : 모델개발 및 실험과의 비교

Hydrogen Encapsulation in Cs Ion-Exchanged Zeolite A : Model Development and Comparison with Experiment

김동현 허남호 김종태

Kim DH Heo NH Kim JT

HWAHAK KONGHAK, June 1994, 32(3), 281-287(7), NONE

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Abstract

Cs 이온교환된 제올라이트 A의 수소 encapsulation에 수식모델을 개발하였다. Encapsulation에 관한 종전의 모델 [2]과 비교했을 때 수소분자가 O₆-window를 통하여 인접한 α- cage로 부터 β- cage로 들어가게 하였다는 점에서 β- cage encapsulation 과정을 올바르게 고려하고 있다. 이 모델을 승온 decapsulation에 적용하여 보았을 때 모델계산치와 실험치가 매우 일치하는 것을 관찰하였다. 실험범위내에서는 확산계수 및 cage간 물질전달계수에 대한 encapsulation 압력의 영향은 없었다. 또한 α- cage 농도 대 β- cage 농도의 등온선들은 encapsulation 온도에 영향을 받지 않았고 이는 두 cage애 조정된 수소분자의 에너지가 서로 같다는 것을 의미하고 있다.

A mathematical model is developed for hydrogen encapsulation in Cs ion-exchanged zeolite A. In comparison with the previous mode[2] on encapsulation, the present model correctly considers the route to -cage encapsulation in that hydrogen molecules are allowed to enter into a -cage only from the neighboring -cage through toe O₆-window connecting the two cages. When the model is applied to temperature programmed decapsulation, excellent agreements were observed between the model predictions and the experimental data. In the investigated range, no influence of the encapsulation pressure was found on the diffusivity through -cages and on the mass transfer coefficient between the two types of cages. Also the encapsulation temperature had no effect on the isotherms of -cage concentration versus -cage concentration, indicating that the energy level of the hydrogen molecule is the same in both cages.

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References

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