Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases
© 2020 American Chemical Society. Stepped adsorption isotherms with desorption hysteresis were measured for nitrogen, argon, ethane, carbon dioxide, and methane at pressures up to 17 MPa on zeolitic imidazolate framework-7 (ZIF-7) using a gravimetric sorption analyzer. Such stepped sorption isotherm...
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| Format: | Journal Article |
| Language: | English |
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AMER CHEMICAL SOC
2020
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| Online Access: | http://purl.org/au-research/grants/arc/DP190100983 http://hdl.handle.net/20.500.11937/82396 |
| _version_ | 1848764501302706176 |
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| author | Yang, X. Arami-Niya, Arash Xiao, G. May, E.F. |
| author_facet | Yang, X. Arami-Niya, Arash Xiao, G. May, E.F. |
| author_sort | Yang, X. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2020 American Chemical Society. Stepped adsorption isotherms with desorption hysteresis were measured for nitrogen, argon, ethane, carbon dioxide, and methane at pressures up to 17 MPa on zeolitic imidazolate framework-7 (ZIF-7) using a gravimetric sorption analyzer. Such stepped sorption isotherms have not been previously reported for nitrogen or argon on ZIF-7, and required the application of pressures as high as 15 MPa to trigger the ZIF-7 structural phase transition at temperatures around 360 K. The stepped hysteretic sorption isotherms measured for carbon dioxide, methane, and ethane were consistent with previous observations reported in the literature. To correlate these stepped hysteretic sorption isotherms, a semi-empirical model was developed by combining a three-parameter Langmuir equation to describe the Type I aspect of the isotherm, with a model designed to describe the temperature-dependent ZIF-7 structural phase transition. Excellent fits of the combined adsorption and desorption branches were achieved by adjusting nine parameters in the temperature-dependent model, with root-mean-square deviations within 2.5 % of the highest measured adsorption capacity. Each parameter of the new semi-empirical model has a physical basis, allowing them to be estimated or compared independently. |
| first_indexed | 2025-11-14T11:20:21Z |
| format | Journal Article |
| id | curtin-20.500.11937-82396 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:20:21Z |
| publishDate | 2020 |
| publisher | AMER CHEMICAL SOC |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-823962021-12-03T02:57:15Z Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases Yang, X. Arami-Niya, Arash Xiao, G. May, E.F. Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science METAL-ORGANIC FRAMEWORK EQUATION-OF-STATE CARBON-DIOXIDE THERMAL-EXPANSION MELTING LINE THERMODYNAMIC PROPERTIES STRUCTURAL TRANSITIONS ADSORPTION EQUILIBRIUM FLUID REGION DEW POINTS © 2020 American Chemical Society. Stepped adsorption isotherms with desorption hysteresis were measured for nitrogen, argon, ethane, carbon dioxide, and methane at pressures up to 17 MPa on zeolitic imidazolate framework-7 (ZIF-7) using a gravimetric sorption analyzer. Such stepped sorption isotherms have not been previously reported for nitrogen or argon on ZIF-7, and required the application of pressures as high as 15 MPa to trigger the ZIF-7 structural phase transition at temperatures around 360 K. The stepped hysteretic sorption isotherms measured for carbon dioxide, methane, and ethane were consistent with previous observations reported in the literature. To correlate these stepped hysteretic sorption isotherms, a semi-empirical model was developed by combining a three-parameter Langmuir equation to describe the Type I aspect of the isotherm, with a model designed to describe the temperature-dependent ZIF-7 structural phase transition. Excellent fits of the combined adsorption and desorption branches were achieved by adjusting nine parameters in the temperature-dependent model, with root-mean-square deviations within 2.5 % of the highest measured adsorption capacity. Each parameter of the new semi-empirical model has a physical basis, allowing them to be estimated or compared independently. 2020 Journal Article http://hdl.handle.net/20.500.11937/82396 10.1021/acs.langmuir.0c02279 English http://purl.org/au-research/grants/arc/DP190100983 http://purl.org/au-research/grants/arc/IC150100019 AMER CHEMICAL SOC fulltext |
| spellingShingle | Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science METAL-ORGANIC FRAMEWORK EQUATION-OF-STATE CARBON-DIOXIDE THERMAL-EXPANSION MELTING LINE THERMODYNAMIC PROPERTIES STRUCTURAL TRANSITIONS ADSORPTION EQUILIBRIUM FLUID REGION DEW POINTS Yang, X. Arami-Niya, Arash Xiao, G. May, E.F. Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title | Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title_full | Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title_fullStr | Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title_full_unstemmed | Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title_short | Flexible Adsorbents at High Pressure: Observations and Correlation of ZIF-7 Stepped Sorption Isotherms for Nitrogen, Argon, and Other Gases |
| title_sort | flexible adsorbents at high pressure: observations and correlation of zif-7 stepped sorption isotherms for nitrogen, argon, and other gases |
| topic | Science & Technology Physical Sciences Technology Chemistry, Multidisciplinary Chemistry, Physical Materials Science, Multidisciplinary Chemistry Materials Science METAL-ORGANIC FRAMEWORK EQUATION-OF-STATE CARBON-DIOXIDE THERMAL-EXPANSION MELTING LINE THERMODYNAMIC PROPERTIES STRUCTURAL TRANSITIONS ADSORPTION EQUILIBRIUM FLUID REGION DEW POINTS |
| url | http://purl.org/au-research/grants/arc/DP190100983 http://purl.org/au-research/grants/arc/DP190100983 http://hdl.handle.net/20.500.11937/82396 |