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Influence of zeolite acidity on proton conductivity of FAU embedded imidazole.

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Title: Influence of zeolite acidity on proton conductivity of FAU embedded imidazole.
Authors: Jankowska, Aldona1 aljan@amu.edu.pl, Ostrowski, Adam2, Zieliński, Michał1, Kowalak, Stanisław1
Source: Microporous & Mesoporous Materials. Jan2019, Vol. 274, p33-42. 10p.
Subjects: Zeolites, Proton conductivity, Imidazoles, Proton transfer reactions, Hydrogen bonding, Thermal properties
Abstract: Abstract Imidazole entrapped in H-forms of FAU zeolites with various Si/Al ratios (1, 4, 40) exhibit high and stable proton conductivity (up to ∼10−3 S/cm) in a broad range of temperatures (293–393 K). The conductivity increases with temperature and imidazole loading. The number and strength of zeolite acid sites (resulting from various Si/Al) influence markedly the conductivity of composites. The samples based on zeolites with low Si/Al (1) show markedly higher conduction than these supported on the matrix with medium Si/Al (4), regardless of very similar number of the acid OH groups. The strong acid OH groups in zeolite with Si/Al = 4 result in protonation and immobilization of adsorbed imidazole, which reduce their mobility and subsequently the conduction. The low siliceous with weaker acid sites protonate imidazole and form a chain of H-bonds effective in proton propagation. Almost neutral high silica matrix provides a high mobility of dispersed imidazole, due to weak mutual interaction. The overloaded samples indicate a phase transition effect at elevated temperature due to melting of extra-matrix imidazole, which is reflected in dramatic increase in conductivity. Graphical abstract Image 1 Highlights • Proton conductivity of imidazole entrapped in H-forms of faujasites. • Role of imidazole loading, phase transition at high temperature. • Influence of Si/Al on efficiency and mechanism of conduction. [ABSTRACT FROM AUTHOR]
Copyright of Microporous & Mesoporous Materials is the property of Elsevier B.V. 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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DbLabel: Engineering Source
An: 132659113
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PubTypeId: academicJournal
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  Data: Influence of zeolite acidity on proton conductivity of FAU embedded imidazole.
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  Data: <searchLink fieldCode="AR" term="%22Jankowska%2C+Aldona%22">Jankowska, Aldona</searchLink><relatesTo>1</relatesTo><i> aljan@amu.edu.pl</i><br /><searchLink fieldCode="AR" term="%22Ostrowski%2C+Adam%22">Ostrowski, Adam</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Zieliński%2C+Michał%22">Zieliński, Michał</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kowalak%2C+Stanisław%22">Kowalak, Stanisław</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Microporous+%26+Mesoporous+Materials%22">Microporous & Mesoporous Materials</searchLink>. Jan2019, Vol. 274, p33-42. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+conductivity%22">Proton conductivity</searchLink><br /><searchLink fieldCode="DE" term="%22Imidazoles%22">Imidazoles</searchLink><br /><searchLink fieldCode="DE" term="%22Proton+transfer+reactions%22">Proton transfer reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrogen+bonding%22">Hydrogen bonding</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+properties%22">Thermal properties</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract Imidazole entrapped in H-forms of FAU zeolites with various Si/Al ratios (1, 4, 40) exhibit high and stable proton conductivity (up to ∼10−3 S/cm) in a broad range of temperatures (293–393 K). The conductivity increases with temperature and imidazole loading. The number and strength of zeolite acid sites (resulting from various Si/Al) influence markedly the conductivity of composites. The samples based on zeolites with low Si/Al (1) show markedly higher conduction than these supported on the matrix with medium Si/Al (4), regardless of very similar number of the acid OH groups. The strong acid OH groups in zeolite with Si/Al = 4 result in protonation and immobilization of adsorbed imidazole, which reduce their mobility and subsequently the conduction. The low siliceous with weaker acid sites protonate imidazole and form a chain of H-bonds effective in proton propagation. Almost neutral high silica matrix provides a high mobility of dispersed imidazole, due to weak mutual interaction. The overloaded samples indicate a phase transition effect at elevated temperature due to melting of extra-matrix imidazole, which is reflected in dramatic increase in conductivity. Graphical abstract Image 1 Highlights • Proton conductivity of imidazole entrapped in H-forms of faujasites. • Role of imidazole loading, phase transition at high temperature. • Influence of Si/Al on efficiency and mechanism of conduction. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: <i>Copyright of Microporous & Mesoporous Materials is the property of Elsevier B.V. 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:
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      – Type: doi
        Value: 10.1016/j.micromeso.2018.07.034
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 33
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      – SubjectFull: Zeolites
        Type: general
      – SubjectFull: Proton conductivity
        Type: general
      – SubjectFull: Imidazoles
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      – SubjectFull: Proton transfer reactions
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      – SubjectFull: Hydrogen bonding
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      – SubjectFull: Thermal properties
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      – TitleFull: Influence of zeolite acidity on proton conductivity of FAU embedded imidazole.
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            NameFull: Ostrowski, Adam
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            – D: 15
              M: 01
              Text: Jan2019
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              Y: 2019
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