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자료유형
학술저널
저자정보
Lee, Hyun Chul (Department of Chemical Engineering, Pukyong National University) Kim, Kyung Min (Department of Chemical Engineering, Pukyong National University) Choi, Sung Il (Department of Chemical Engineering, Pukyong National University) Kim, Yong Ha (Department of Chemical Engineering, Pukyong National University) Woo, Hee Chul (Department of Chemical Engineering, Pukyong National University) Won, Yong Sun (Department of Chemical Engineering, Pukyong National University)
저널정보
한국화학공학회 화학공학 화학공학 제56권 제6호
발행연도
2018.1
수록면
909 - 913 (5page)

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A hydrocarbon trap (HT) plays an important role of controlling vehicle emissions in the so-called cold emission period by holding hydrocarbons until three way catalysts (TWCs) are thermally activated. In this study, we have investigated the adsorption characteristics of cation (H, La, K, and Ag)-exchanged ZSM-5 zeolites for hydrocarbons (propylene, n-butane, and toluene) by DFT (density functional theory)-based computational chemistry. Cation exchange is to improve the hydrothermal stability of zeolites and their adsorption capacity, thereby rendering cation-exchanged zeolites promising materials for HT. The idea of cluster approximation makes the calculation of adsorption energies superbly efficient in computation. The results showed that Ag-exchanged ZSM-5 would be the best for the adsorption of all three adsorbates, without often encountered Ag oxidation in experiments. Besides, the hydrothermal stability of La-exchanged ZSM-5 was confirmed from the change of geometrical parameters by cation exchange, and it showed good adsorption capacity for propylene and toluene. Hydrogen-exchanged ZSM-5 was also good for hydrogen adsorption, but had poor hydrothermal stability.

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