Molecular Simulation of Adsorption and Diffusion of CH4 and H2 in ZIF-8 Material

doi:10.6023/A12110858

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (24): 2518-2524.DOI: 10.6023/A12110858 Previous Articles Next Articles

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ZIF-8材料中CH₄/H₂吸附与扩散的分子模拟

吴选军, 杨旭, 宋杰, 蔡卫权

武汉理工大学化学工程学院武汉 430070

投稿日期:2012-11-02 发布日期:2012-12-04
通讯作者: 吴选军, 蔡卫权 E-mail:wuxuanjun@whut.edu.cn; wqcai@home.ipe.ac.cn
基金资助:
项目受中央高校基本科研业务费专项资金(No. 2012142)和国家自然科学基金(Nos. 51142002, 51272201)资助.

Molecular Simulation of Adsorption and Diffusion of CH₄ and H₂ in ZIF-8 Material

Wu Xuanjun, Yang Xu, Song Jie, Cai Weiquan

School of Chemical Engineering, Wuhan University of Technology, Wuhan 430070

Received:2012-11-02 Published:2012-12-04
Supported by:
Project supported by the Fundamental Research Funds for the Central Universities (No. 2012142) and the National Natural Science Foundation of China (Nos. 51142002, 51272201).

Metal-organic frameworks (MOFs) with flexible organic linkers and bridging tetrahedral metal ions were extensively investigated in order to improve the selectivity and storage properties of sorbents. The so-called zeolitic imidazolate frameworks (ZIFs) are a particularly interesting class of MOFs due to their exceptional chemical and thermal stability. Adsorption and diffusion characteristics of CH₄ and H₂ in porous zeolitic imidazolate framework-8 (ZIF-8) material were comparatively studied using the methods of equilibrium molecular dynamics (EMD) and the grand canonical Monte Carlo (GCMC) with the same force field. It was shown that using the force field of framework flexibility not only can reproduce the crystal structure of ZIF-8 at different temperatures and pressures well, but also can calculate the diffusion coefficients of CH₄ and H₂ in ZIF-8 at different temperatures accurately. Especially, adsorbed CH₄ at high temperature can run away the space constraint at the entrance of framework cage in ZIF-8, which results in a sharp increase of its diffusion coefficient. At the same time, using the force field can also simulate the adsorption isotherms of CH₄ and H₂ molecules in ZIF-8 roughly. Thus, their probability density distribution data in the unit cell of ZIF-8 under the conditions of adsorption and diffusion equilibrium can be calculated via the self-compiled program and further visualized via the software of VMD in order to analyze the adsorption and diffusion behavior of the gases. The results indicate that the priority locations for adsorption of CH₄ and H₂ molecules in ZIF-8 are regions close to the imidazole rings in the center of big pores. But there are two different levels of the preferential adsorption sites for CH₄ and only one level of that for H₂, indicating that different adsorption mechanism of CH₄ and H₂ exists in ZIF-8. The difference of the preferential adsorption sites for CH₄ and H₂ in ZIF-8 is possibly resulting from the different size of the two molecules.

Key words: molecular dynamics, GCMC, ZIF-8, isothermal adsorption, diffusion coefficient

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Wu Xuanjun, Yang Xu, Song Jie, Cai Weiquan. Molecular Simulation of Adsorption and Diffusion of CH₄ and H₂ in ZIF-8 Material[J]. Acta Chimica Sinica, 2012, 70(24): 2518-2524.

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ZIF-8材料中CH₄/H₂吸附与扩散的分子模拟

Molecular Simulation of Adsorption and Diffusion of CH₄ and H₂ in ZIF-8 Material

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ZIF-8材料中CH4/H2吸附与扩散的分子模拟