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Hybrid MOFs-graphene composites: Correlation between thermal transport and kinetics of hydrogen adsorption.

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Title: Hybrid MOFs-graphene composites: Correlation between thermal transport and kinetics of hydrogen adsorption.
Authors: Streza, M.1 (AUTHOR) streza.mihaela@gmail.com, Grad, O.1 (AUTHOR), Lazar, D.1 (AUTHOR), Depriester, M.1 (AUTHOR), Longuemart, S.1 (AUTHOR), Sahraoui, A.H.1 (AUTHOR), Blanita, G.1 (AUTHOR) Gabriela.Blanita@itim-cj.ro, Lupu, D.1 (AUTHOR)
Source: International Journal of Heat & Mass Transfer. Nov2019, Vol. 143, pN.PAG-N.PAG. 1p.
Subjects: Adsorption kinetics, Hydrogen as fuel, Thermal conductivity, Gas absorption & adsorption, Magnesium hydride, Porous materials, Nanofluids
Abstract: • Use the reduced graphene oxide as additive to make more efficient the heat transfer through MOFs pellets. • The influence of the reduced graphene oxide concentration on thermal properties of pellets with different densities. • Comparison with aluminum as additive in metal-organic frameworks pellets. • Enhancement the thermal conductivity of pellet by a factor of 4. • Improving the hydrogen adsorption kinetic and favoring shorter equilibrium time. The development of effective methods for hydrogen storage is of paramount importance in using hydrogen as a transportation fuel for on-board applications. The rate at which the hydrogen is adsorbed/desorbed on porous materials in compressed pellets is directly related to the thermal conductivity of the adsorbent. This work aims to increase the hydrogen adsorption rate in MIL-101(Cr) and MIL-100(Fe) compressed pellets by using reduced graphene oxide (rGO) as an additive, in order to get an increased thermal conductivity and thus a more efficient heat transport through the pellets. To achieve this goal, a complex study was undertaken using different techniques, namely photothermal radiometry (PTR) for thermal conductivity investigation, a volumetric home-made device for kinetic measurements and other techniques (XRD, SEM, TEM, BET, TG-DTA) for structural and morphological characterization of the samples. It has been found that the thermal conductivity of the pellets increases with the graphene addition. A significant enhancement in thermal conductivity (by factors of 4 compared to pellets without additives) is obtained and reaches a maximum of 0.58 W/mK for MIL-100(Fe) pellet (ρ = 0.65 g/cm3). The hydrogen adsorption equilibrium time in neat samples is reached in about 180 s. The presence of 10 wt% rGO in both MIL-100 and MIL-101 pellets improves the hydrogen adsorption kinetics and favors the equilibrium in shorter times, respectively 20 and 40 s, than in neat samples. The experimental data are in very good agreement with the Linear Driving Force Model (LDF) for gas adsorption kinetics. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 138548791
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  Data: Hybrid MOFs-graphene composites: Correlation between thermal transport and kinetics of hydrogen adsorption.
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  Data: <searchLink fieldCode="AR" term="%22Streza%2C+M%2E%22">Streza, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> streza.mihaela@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Grad%2C+O%2E%22">Grad, O.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lazar%2C+D%2E%22">Lazar, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Depriester%2C+M%2E%22">Depriester, M.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Longuemart%2C+S%2E%22">Longuemart, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sahraoui%2C+A%2EH%2E%22">Sahraoui, A.H.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Blanita%2C+G%2E%22">Blanita, G.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Gabriela.Blanita@itim-cj.ro</i><br /><searchLink fieldCode="AR" term="%22Lupu%2C+D%2E%22">Lupu, D.</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Heat+%26+Mass+Transfer%22">International Journal of Heat & Mass Transfer</searchLink>. Nov2019, Vol. 143, pN.PAG-N.PAG. 1p.
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  Data: <searchLink fieldCode="DE" term="%22Adsorption+kinetics%22">Adsorption kinetics</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+as+fuel%22">Hydrogen as fuel</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+conductivity%22">Thermal conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+absorption+%26+adsorption%22">Gas absorption & adsorption</searchLink><br /><searchLink fieldCode="DE" term="%22Magnesium+hydride%22">Magnesium hydride</searchLink><br /><searchLink fieldCode="DE" term="%22Porous+materials%22">Porous materials</searchLink><br /><searchLink fieldCode="DE" term="%22Nanofluids%22">Nanofluids</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: • Use the reduced graphene oxide as additive to make more efficient the heat transfer through MOFs pellets. • The influence of the reduced graphene oxide concentration on thermal properties of pellets with different densities. • Comparison with aluminum as additive in metal-organic frameworks pellets. • Enhancement the thermal conductivity of pellet by a factor of 4. • Improving the hydrogen adsorption kinetic and favoring shorter equilibrium time. The development of effective methods for hydrogen storage is of paramount importance in using hydrogen as a transportation fuel for on-board applications. The rate at which the hydrogen is adsorbed/desorbed on porous materials in compressed pellets is directly related to the thermal conductivity of the adsorbent. This work aims to increase the hydrogen adsorption rate in MIL-101(Cr) and MIL-100(Fe) compressed pellets by using reduced graphene oxide (rGO) as an additive, in order to get an increased thermal conductivity and thus a more efficient heat transport through the pellets. To achieve this goal, a complex study was undertaken using different techniques, namely photothermal radiometry (PTR) for thermal conductivity investigation, a volumetric home-made device for kinetic measurements and other techniques (XRD, SEM, TEM, BET, TG-DTA) for structural and morphological characterization of the samples. It has been found that the thermal conductivity of the pellets increases with the graphene addition. A significant enhancement in thermal conductivity (by factors of 4 compared to pellets without additives) is obtained and reaches a maximum of 0.58 W/mK for MIL-100(Fe) pellet (ρ = 0.65 g/cm3). The hydrogen adsorption equilibrium time in neat samples is reached in about 180 s. The presence of 10 wt% rGO in both MIL-100 and MIL-101 pellets improves the hydrogen adsorption kinetics and favors the equilibrium in shorter times, respectively 20 and 40 s, than in neat samples. The experimental data are in very good agreement with the Linear Driving Force Model (LDF) for gas adsorption kinetics. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Heat & Mass Transfer is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.ijheatmasstransfer.2019.118539
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 1
        StartPage: N.PAG
    Subjects:
      – SubjectFull: Adsorption kinetics
        Type: general
      – SubjectFull: Hydrogen as fuel
        Type: general
      – SubjectFull: Thermal conductivity
        Type: general
      – SubjectFull: Gas absorption & adsorption
        Type: general
      – SubjectFull: Magnesium hydride
        Type: general
      – SubjectFull: Porous materials
        Type: general
      – SubjectFull: Nanofluids
        Type: general
    Titles:
      – TitleFull: Hybrid MOFs-graphene composites: Correlation between thermal transport and kinetics of hydrogen adsorption.
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            NameFull: Streza, M.
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            – D: 01
              M: 11
              Text: Nov2019
              Type: published
              Y: 2019
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