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Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials.

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Title: Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials.
Authors: Schaefer, S.1 (AUTHOR), Jeder, A.1,2 (AUTHOR), Sdanghi, G.1,3 (AUTHOR), Gadonneix, P.1 (AUTHOR), Abdedayem, A.2 (AUTHOR), Izquierdo, M.T.4 (AUTHOR), Maranzana, G.3 (AUTHOR), Ouederni, A.2 (AUTHOR), Celzard, A.1 (AUTHOR), Fierro, V.1 (AUTHOR) Vanessa.Fierro@univ-lorraine.fr
Source: International Journal of Hydrogen Energy. Nov2020, Vol. 45 Issue 55, p30767-30782. 16p.
Subjects: Activated carbon, Adsorption (Chemistry), Surface chemistry, Pore size distribution, Hydrogen, Surfaces (Technology)
Abstract: The effect of heteroatoms on hydrogen adsorption properties of activated and hybrid carbon materials is critically described. For that purpose, olive stones were activated chemically with KOH, and subsequently washed or not, and oxidised with ozone or not. Olive stones were also activated physically with CO 2. A series of activated carbons prepared by chemical activation of sucrose was also investigated for comparison. As a result, many activated carbons with different pore-size distributions, surface areas, average micropore widths, oxygen contents and amounts of mineral matter could be compared. All were thoroughly characterised by adsorption of N 2 , CO 2 and H 2 O, elemental analysis, XPS, thermogravimetry, and adsorption of H 2 at different pressures. Many correlations between textural parameters, composition and adsorption properties could be evidenced, and were critically discussed. We show that the hydrogen uptake at 77 K is controlled by the following parameters, listed by decreasing order of importance: specific surface area, average micropore size, surface chemistry and shape of the pore size distribution. At room temperature (i.e., at 298 K), the adsorbed hydrogen uptake was in the range of 0.19–0.42 wt %; the presence of large amounts of alkali metals can further improve the hydrogen adsorption properties, but surface chemistry still has a major influence, especially through the acidic surface functions. Image 1 • Olive stones-based carbon materials with high surface area were prepared. • Comparison with other materials highlighted oxygen-promoted H 2 physisorption. • Carboxyl surface groups play an important role in oxygen-promoted H 2 physisorption. • A 26% increase of adsorbed hydrogen was attributed to acidic functions. • Residual carbonates and potassium play a marginal role in physisorption. [ABSTRACT FROM AUTHOR]
Copyright of International Journal of Hydrogen Energy 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 146614386
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials.
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  Data: <searchLink fieldCode="AR" term="%22Schaefer%2C+S%2E%22">Schaefer, S.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Jeder%2C+A%2E%22">Jeder, A.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sdanghi%2C+G%2E%22">Sdanghi, G.</searchLink><relatesTo>1,3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Gadonneix%2C+P%2E%22">Gadonneix, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Abdedayem%2C+A%2E%22">Abdedayem, A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Izquierdo%2C+M%2ET%2E%22">Izquierdo, M.T.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Maranzana%2C+G%2E%22">Maranzana, G.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ouederni%2C+A%2E%22">Ouederni, A.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Celzard%2C+A%2E%22">Celzard, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fierro%2C+V%2E%22">Fierro, V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> Vanessa.Fierro@univ-lorraine.fr</i>
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  Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Hydrogen+Energy%22">International Journal of Hydrogen Energy</searchLink>. Nov2020, Vol. 45 Issue 55, p30767-30782. 16p.
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  Data: <searchLink fieldCode="DE" term="%22Activated+carbon%22">Activated carbon</searchLink><br /><searchLink fieldCode="DE" term="%22Adsorption+%28Chemistry%29%22">Adsorption (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+chemistry%22">Surface chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Pore+size+distribution%22">Pore size distribution</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen%22">Hydrogen</searchLink><br /><searchLink fieldCode="DE" term="%22Surfaces+%28Technology%29%22">Surfaces (Technology)</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The effect of heteroatoms on hydrogen adsorption properties of activated and hybrid carbon materials is critically described. For that purpose, olive stones were activated chemically with KOH, and subsequently washed or not, and oxidised with ozone or not. Olive stones were also activated physically with CO 2. A series of activated carbons prepared by chemical activation of sucrose was also investigated for comparison. As a result, many activated carbons with different pore-size distributions, surface areas, average micropore widths, oxygen contents and amounts of mineral matter could be compared. All were thoroughly characterised by adsorption of N 2 , CO 2 and H 2 O, elemental analysis, XPS, thermogravimetry, and adsorption of H 2 at different pressures. Many correlations between textural parameters, composition and adsorption properties could be evidenced, and were critically discussed. We show that the hydrogen uptake at 77 K is controlled by the following parameters, listed by decreasing order of importance: specific surface area, average micropore size, surface chemistry and shape of the pore size distribution. At room temperature (i.e., at 298 K), the adsorbed hydrogen uptake was in the range of 0.19–0.42 wt %; the presence of large amounts of alkali metals can further improve the hydrogen adsorption properties, but surface chemistry still has a major influence, especially through the acidic surface functions. Image 1 • Olive stones-based carbon materials with high surface area were prepared. • Comparison with other materials highlighted oxygen-promoted H 2 physisorption. • Carboxyl surface groups play an important role in oxygen-promoted H 2 physisorption. • A 26% increase of adsorbed hydrogen was attributed to acidic functions. • Residual carbonates and potassium play a marginal role in physisorption. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of International Journal of Hydrogen Energy 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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      – Type: doi
        Value: 10.1016/j.ijhydene.2020.08.114
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      – Code: eng
        Text: English
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        PageCount: 16
        StartPage: 30767
    Subjects:
      – SubjectFull: Activated carbon
        Type: general
      – SubjectFull: Adsorption (Chemistry)
        Type: general
      – SubjectFull: Surface chemistry
        Type: general
      – SubjectFull: Pore size distribution
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      – SubjectFull: Hydrogen
        Type: general
      – SubjectFull: Surfaces (Technology)
        Type: general
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      – TitleFull: Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials.
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              Text: Nov2020
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