Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Desorption of Water, Ammonia, and Methylamines on $K^+$ Ion Exchanged Zeolite L

칼륨 이온 치환 제올라이트-L 에서 물, 암모니아 및 메틸아민류의 탈착

  • Sung-Doo Moon (Department of Chemistry, College of Natural Science, Dongeui University) ;
  • Dai-Ung Choi (Department of Chemistry, College of Natural Science, Dongeui University) ;
  • Un-Sik Kim (Department of Chemistry, College of Natural Sciences, Pusan National University) ;
  • Yang Kim (Department of Chemistry, College of Natural Science, Dongeui University)
  • 문성두 (동의대학교 자연과학대학 화학과) ;
  • 최대웅 (동의대학교 공과대학 화학공학과) ;
  • 김은식 (부산대학교 자연과학대학 화학과) ;
  • 김양 (동의대학교 자연과학대학 화학과)
  • Published : 1988.06.20
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Abstract

The potential energy of adsorbate molecules in the main channel of $K^+$ ion exchanged zeolite L(K-L) was calculated. In K-L which adsorbs three molecules per unit cell, the interaction energies of $H_2O,\;NH_3,\;CH_3NH_2,\;(CH_3)_2NH,\;and\;(CH_3)_3N$ molecules with zeolite lattice are 61.11, 62.31, 65.68, 74.65, and 79.88kJ/mol, respectively. These values are less by 3.7∼12.6kJ/mol than $K^+$ ion affinities with adsorbing molecules. These results may be due to the facts that the electrostatic energies are reduced by the negative charge of the lattice oxygens. The distribution of adsorption sites of $NH_3$ and $CH_3NH_2$ in K-L was investigated by a technique of temperature programmed desorption. The experimental value of desorption energies of $NH_3$ and $CH_3NH_2$ on K-L are in good agreement with the theoritical values. It is concluded that the desorption of $NH_3$ and $CH_3NH_2$ on K-L is the first-order desorption with free readsorption.

$K^+$이온 치환 제올라이트-L(K-L)의 main channel에 있는 흡착 분자의 퍼텐셜 에너지를 계산하였다. 단위 세포에 3분자가 흡착된 K-L에서 제올라이트 격자와 $H_2O,\;NH_3,\;CH_3NH_2,\;(CH_3)_2NH$ 및 $(CH_3)_3NR 분자와의 상호작용 에너지는 각각 61.11, 62.31, 65.68, 74.65, 79.88 kJ/mol이다. 이들 값은 $K^+$이온과의 친화력보다 $3.7{\sim}12.6kJ/mol$이 작다. 이들 결과는 골조 산소의 음전하에 의해서 정전기적 에너지가 감소되기 때문일 것이다. K-L에 관해서 $NH_3$와 $CH_3NH_2$의 흡착자리 분포를 승온탈착법에 의하여 연구하였다. K-L에서 NH3와 CH3NH2의 실험적 탈착에너지는 이론적 값과 잘 일치하였다. $NH_3$와 $CH_3NH_2$의 탈착은 재흡착이 일어나는 1차 탈착반응이다.

Keywords

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