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이온교환한 제올라이트 A의 연료기체 분자 저장 특성-III. A-zeolite의 8원환 window상에서의 CO 흡착이론
Fuel Gas Encapsulation in Ion-exchanged Zeolite-A III. CO Adsorption on the 8-Membered Ring Window
HWAHAK KONGHAK, December 1992, 30(6), 710-717(8), NONE
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Abstract
Na+, K+, Mg2+ 그리고 Ca2+로 포화되어진 A-zeolite의 8원환에 CO가 흡착되어지는 과정에서 일어나는 atomic 전하와 결합차수 그리고 안정화 에너지들을 CNDO/2M.O. 방법으로 계산하였다. 8원환 평면 내에서 Na+ 이온과 Mg2+ 이온의 배치는 중요한 의미를 지닌다. 양이온에 흡착되어진 CO분자들의 이면각들은 Na+-A에서 75O, Mg2+-A에서 62.7O, K+-A에서 48.5O 그리고 Ca2+-A에서 89o였다. Na+-A에서 CO의 흡착과정은 2단계 접근으로써 이루어지고, 양이온과의 공유 결합에 의해 가장 높은 흡착 에너지를 나타낸다. 양이온에 대한 CO흡착 에너지들은 Na+-A>Mg2+-A>Ca2+-A와 같은 순서로 감소한다.
Atomic charges, bond order, stabilization energys of 8-membered ring window structures on Na+, K+, Mg2+, Ca2+ saturated A-zeolites, in the course of CO adsorption process, have been calculated by CNDO/2MO method. Localization of Na+ ion and Mg2+ ion within the 8-membered ring plane was calcula-ted. Dihedral angles of CO molecules adsorbed on the cations were 75ofor Na+-A, 62.7o for Mg2+-A, 48.5o for K+-A and 89o for Ca2+-A. adsorption process of CO on the Na+-A was performed by two step approach and the indicated highest adsorption energy due to the covalent bond with the cation. Adsorption energies of CO on the cation were in the decreasing order;Na+-A>Mg2+-A>K+-A>Ca2+-A.
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