Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO2 and water adsorption

doi:10.1016/j.cjche.2016.10.012

›› 2017, Vol. 25 ›› Issue (5): 595-601.DOI: 10.1016/j.cjche.2016.10.012

• Separation Science and Engineering • 上一篇下一篇

Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO₂ and water adsorption

Mahdi Niknam Shahrak¹, Morteza Niknam Shahrak², Akbar Shahsavand², Nasser Khazeni³, Xiaofei Wu³, Shuguang Deng⁴

1 Chemical Engineering Department, Faculty of Engineering, Quchan University of Advanced Technology, Quchan, P.O. Box 84686-94717, Iran;
2 Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, P.O. Box 91775-1111, Iran;
3 Chemical Engineering Department, New Mexico State University, Las Cruces, New Mexico 88003, USA;
4 Chemical Engineering Department, Arizona State University, USA

收稿日期:2016-02-19 修回日期:2016-10-19 出版日期:2017-05-28 发布日期:2017-07-06
通讯作者: Mahdi Niknam Shahrak,E-mail addresses:m.niknam.sh@qiet.ac.ir;Shuguang Deng,E-mail addresses:Shuguang.Deng@ASU.Edu

Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO₂ and water adsorption

Mahdi Niknam Shahrak¹, Morteza Niknam Shahrak², Akbar Shahsavand², Nasser Khazeni³, Xiaofei Wu³, Shuguang Deng⁴

1 Chemical Engineering Department, Faculty of Engineering, Quchan University of Advanced Technology, Quchan, P.O. Box 84686-94717, Iran;
2 Chemical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, P.O. Box 91775-1111, Iran;
3 Chemical Engineering Department, New Mexico State University, Las Cruces, New Mexico 88003, USA;
4 Chemical Engineering Department, Arizona State University, USA

Received:2016-02-19 Revised:2016-10-19 Online:2017-05-28 Published:2017-07-06

摘要/Abstract

摘要： Reliable estimation of the pore size distribution (PSD) in porous materials such as metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) is crucial for accurately assessing adsorption capacity and corresponding selectivity. In this study, the so-called zeolitic imidazolate framework-7 (ZIF-7) is successfully synthesized via relatively fast and convenient microwave technique. The morphology and structure of the obtained MOF were characterized by XRD, SEM and N₂ and CO₂ adsorption/desorption isotherms at 77 K and 0℃ respectively. Then, to determine the PSD of the fabricated MOF, carbon dioxide isotherms are experimentally measured at various temperatures up to atmospheric pressure. Afterward, the experimental CO₂ isotherms data are utilized in two recently proposed in-house algorithms of SHN1 and SHN2 to extract the true PSD of manufactured ZIF-7. The obtained results revealed that median pore diameter of the fabricated ZIF-7 is estimated around 0.404 nm and 0.370 nm by using CO₂ isotherms at 273 K and 298 K respectively. These values are in good agreement with the real pore diameter of 0.42 nm. Moreover, experimental data of water adsorption isotherms over four different MOFs, borrowed from literature, are employed to illustrate further effectiveness of the above algorithms on successful determination of the corresponding pore size distributions. All predicted PSDs are proved to be in good agreement with those obtained from independent methods such as topology and morphology studies.

关键词: ZIF-7, Metal-organic framework, Size distribution, Adsorption, CO₂ capture, Gas

Abstract: Reliable estimation of the pore size distribution (PSD) in porous materials such as metal-organic frameworks (MOFs) and zeolitic imidazolate frameworks (ZIFs) is crucial for accurately assessing adsorption capacity and corresponding selectivity. In this study, the so-called zeolitic imidazolate framework-7 (ZIF-7) is successfully synthesized via relatively fast and convenient microwave technique. The morphology and structure of the obtained MOF were characterized by XRD, SEM and N₂ and CO₂ adsorption/desorption isotherms at 77 K and 0℃ respectively. Then, to determine the PSD of the fabricated MOF, carbon dioxide isotherms are experimentally measured at various temperatures up to atmospheric pressure. Afterward, the experimental CO₂ isotherms data are utilized in two recently proposed in-house algorithms of SHN1 and SHN2 to extract the true PSD of manufactured ZIF-7. The obtained results revealed that median pore diameter of the fabricated ZIF-7 is estimated around 0.404 nm and 0.370 nm by using CO₂ isotherms at 273 K and 298 K respectively. These values are in good agreement with the real pore diameter of 0.42 nm. Moreover, experimental data of water adsorption isotherms over four different MOFs, borrowed from literature, are employed to illustrate further effectiveness of the above algorithms on successful determination of the corresponding pore size distributions. All predicted PSDs are proved to be in good agreement with those obtained from independent methods such as topology and morphology studies.

Key words: ZIF-7, Metal-organic framework, Size distribution, Adsorption, CO₂ capture, Gas

Mahdi Niknam Shahrak, Morteza Niknam Shahrak, Akbar Shahsavand, Nasser Khazeni, Xiaofei Wu, Shuguang Deng. Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO₂ and water adsorption[J]. , 2017, 25(5): 595-601.

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Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO₂ and water adsorption

Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO₂ and water adsorption

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