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

Mahdi Niknam Shahrak, Morteza Niknam Shahrak, Akbar Shahsavand, Nasser Khazeni, Xiaofei Wu, Shuguang Deng

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 77K and 0°C 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 0.404nm and 0.370nm by using CO2 isotherms at 273K and 298K respectively. These values are in good agreement with the real pore diameter of 0.42nm. 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.

Original languageEnglish (US)
JournalChinese Journal of Chemical Engineering
DOIs
StateAccepted/In press - Feb 19 2016

Fingerprint

Gas adsorption
Synthesis gas
Adsorption
Pore size
Isotherms
Gases
Metals
Water
Atmospheric Pressure
Microwaves
Organic carbon
Adsorption isotherms
Carbon Dioxide
Atmospheric pressure
Porous materials
Desorption
Carbon dioxide
Topology
Scanning electron microscopy
Temperature

Keywords

  • Adsorption
  • CO capture
  • Gas
  • Metal-organic framework
  • Size distribution
  • ZIF-7

ASJC Scopus subject areas

  • Environmental Engineering
  • Chemistry(all)
  • Biochemistry
  • Chemical Engineering(all)

Cite this

Synthesis, gas adsorption and reliable pore size estimation of zeolitic imidazolate framework-7 using CO2 and water adsorption. / Niknam Shahrak, Mahdi; Niknam Shahrak, Morteza; Shahsavand, Akbar; Khazeni, Nasser; Wu, Xiaofei; Deng, Shuguang.

In: Chinese Journal of Chemical Engineering, 19.02.2016.

Research output: Contribution to journalArticle

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AU - Shahsavand, Akbar

AU - Khazeni, Nasser

AU - Wu, Xiaofei

AU - Deng, Shuguang

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AB - 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 77K and 0°C 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 0.404nm and 0.370nm by using CO2 isotherms at 273K and 298K respectively. These values are in good agreement with the real pore diameter of 0.42nm. 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.

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