SCI和EI收录∣中国化工学会会刊

Chinese Journal of Chemical Engineering ›› 2022, Vol. 42 ›› Issue (2): 1-9.DOI: 10.1016/j.cjche.2021.08.013

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Large-scale simulations of CO2 diffusion in metal-organic frameworks with open Cu sites

Tongan Yan1, Minman Tong2, Qingyuan Yang1, Dahuan Liu1, Yandong Guo3, Chongli Zhong4   

  1. 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
    2. School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China;
    3. College of Mathematics Science, Bohai University, Jinzhou 121013, China;
    4. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
  • Received:2021-05-29 Revised:2021-08-14 Online:2022-03-30 Published:2022-02-28
  • Contact: Yandong Guo,E-mail:guoyandong@qymail.bhu.edu.cn;Chongli Zhong,E-mail:zhongchongli@tiangong.edu.cn
  • Supported by:
    This work is supported by National Key Research and Development Program of China (2016YFB0600901) and the Natural Science Foundation of China (22038010, 21878229, 22078024 and 21978005).

Large-scale simulations of CO2 diffusion in metal-organic frameworks with open Cu sites

Tongan Yan1, Minman Tong2, Qingyuan Yang1, Dahuan Liu1, Yandong Guo3, Chongli Zhong4   

  1. 1. State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China;
    2. School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China;
    3. College of Mathematics Science, Bohai University, Jinzhou 121013, China;
    4. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China
  • 通讯作者: Yandong Guo,E-mail:guoyandong@qymail.bhu.edu.cn;Chongli Zhong,E-mail:zhongchongli@tiangong.edu.cn
  • 基金资助:
    This work is supported by National Key Research and Development Program of China (2016YFB0600901) and the Natural Science Foundation of China (22038010, 21878229, 22078024 and 21978005).

Abstract: Understanding CO2 diffusion behavior in functional nanoporous materials is beneficial for improving the CO2 adsorption, separation, and conversion performances. However, it is a great challenge for studying the diffusion process in experiments. Herein, CO2 diffusion in 962 metal-organic frameworks (MOFs) with open Cu sites was systematically investigated by theoretical methods in the combination of molecular dynamic simulations and density functional theory (DFT) calculations. A specific force field was derived from DFT-D2 method combined with Grimme's dispersion-corrected (D2) density functional to well describe the interaction energies between Cu and CO2. It is observed that the suitable topology is conductive to CO2 diffusion, and 2D-MOFs are more flexible in tuning and balancing the CO2 adsorption and diffusion behaviors than 3D-MOFs. In addition, analysis of diffusive trajectories and the residence times on different positions indicate that CO2 diffusion is mainly along with the frameworks in these MOFs, jumping from one strong adsorption site to another. It is also influenced by the electrostatic interaction of the frameworks. Therefore, the obtained information may provide useful guidance for the rational design and synthesis of MOFs with enhanced CO2 diffusion performance for specific applications.

Key words: Metal–organic frameworks, Open Cu sites, Molecular simulations, Carbon dioxide, Diffusion

摘要: Understanding CO2 diffusion behavior in functional nanoporous materials is beneficial for improving the CO2 adsorption, separation, and conversion performances. However, it is a great challenge for studying the diffusion process in experiments. Herein, CO2 diffusion in 962 metal-organic frameworks (MOFs) with open Cu sites was systematically investigated by theoretical methods in the combination of molecular dynamic simulations and density functional theory (DFT) calculations. A specific force field was derived from DFT-D2 method combined with Grimme's dispersion-corrected (D2) density functional to well describe the interaction energies between Cu and CO2. It is observed that the suitable topology is conductive to CO2 diffusion, and 2D-MOFs are more flexible in tuning and balancing the CO2 adsorption and diffusion behaviors than 3D-MOFs. In addition, analysis of diffusive trajectories and the residence times on different positions indicate that CO2 diffusion is mainly along with the frameworks in these MOFs, jumping from one strong adsorption site to another. It is also influenced by the electrostatic interaction of the frameworks. Therefore, the obtained information may provide useful guidance for the rational design and synthesis of MOFs with enhanced CO2 diffusion performance for specific applications.

关键词: Metal–organic frameworks, Open Cu sites, Molecular simulations, Carbon dioxide, Diffusion