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Impact of structural defects and hydronium ion concentration on the stability of zeolite BEA in aqueous phase.

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Title: Impact of structural defects and hydronium ion concentration on the stability of zeolite BEA in aqueous phase.
Authors: Prodinger, Sebastian1, Shi, Hui1, Wang, Huamin1, Derewinski, Miroslaw A.1 miroslaw.derewinski@pnnl.gov, Lercher, Johannes A.1,2 Johannes.Lercher@pnnl.gov
Source: Applied Catalysis B: Environment & Energy. Dec2018, Vol. 237, p996-1002. 7p.
Subjects: Oxonium ions, Point defects, Zeolites, Aqueous solutions, Hydrothermal synthesis, Thermal stability
Abstract: The presence of fluoride anions in the synthesis gel leads to zeolite BEA with high hydrothermal stability. This longer lifetime is caused by a lower concentration of internal silanol defects that are sites of the initial framework hydrolysis eventually destroying the lattice structure. The lifetime of these zeolites was the higher the lower the concentration of framework bridging hydroxyl groups that form hydronium ions was. While lattice hydrolysis was initiated at defect sites in all cases, the role of defects became less important as the concentration of hydronium ions increased. At higher concentration of hydrated hydronium ions, the presence of water associated with the hydrated hydronium ions limits the useful lifetime of zeolite catalysts in water. For such materials, the selective hydrophobization of the external surface extends the lifetime. [ABSTRACT FROM AUTHOR]
Copyright of Applied Catalysis B: Environment & Energy 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: 131129777
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PubTypeId: academicJournal
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  Data: Impact of structural defects and hydronium ion concentration on the stability of zeolite BEA in aqueous phase.
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  Data: <searchLink fieldCode="AR" term="%22Prodinger%2C+Sebastian%22">Prodinger, Sebastian</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shi%2C+Hui%22">Shi, Hui</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Huamin%22">Wang, Huamin</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Derewinski%2C+Miroslaw+A%2E%22">Derewinski, Miroslaw A.</searchLink><relatesTo>1</relatesTo><i> miroslaw.derewinski@pnnl.gov</i><br /><searchLink fieldCode="AR" term="%22Lercher%2C+Johannes+A%2E%22">Lercher, Johannes A.</searchLink><relatesTo>1,2</relatesTo><i> Johannes.Lercher@pnnl.gov</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Catalysis+B%3A+Environment+%26+Energy%22">Applied Catalysis B: Environment & Energy</searchLink>. Dec2018, Vol. 237, p996-1002. 7p.
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  Data: <searchLink fieldCode="DE" term="%22Oxonium+ions%22">Oxonium ions</searchLink><br /><searchLink fieldCode="DE" term="%22Point+defects%22">Point defects</searchLink><br /><searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink><br /><searchLink fieldCode="DE" term="%22Aqueous+solutions%22">Aqueous solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrothermal+synthesis%22">Hydrothermal synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Thermal+stability%22">Thermal stability</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The presence of fluoride anions in the synthesis gel leads to zeolite BEA with high hydrothermal stability. This longer lifetime is caused by a lower concentration of internal silanol defects that are sites of the initial framework hydrolysis eventually destroying the lattice structure. The lifetime of these zeolites was the higher the lower the concentration of framework bridging hydroxyl groups that form hydronium ions was. While lattice hydrolysis was initiated at defect sites in all cases, the role of defects became less important as the concentration of hydronium ions increased. At higher concentration of hydrated hydronium ions, the presence of water associated with the hydrated hydronium ions limits the useful lifetime of zeolite catalysts in water. For such materials, the selective hydrophobization of the external surface extends the lifetime. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Catalysis B: Environment & Energy 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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      – Type: doi
        Value: 10.1016/j.apcatb.2018.06.065
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 7
        StartPage: 996
    Subjects:
      – SubjectFull: Oxonium ions
        Type: general
      – SubjectFull: Point defects
        Type: general
      – SubjectFull: Zeolites
        Type: general
      – SubjectFull: Aqueous solutions
        Type: general
      – SubjectFull: Hydrothermal synthesis
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      – SubjectFull: Thermal stability
        Type: general
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      – TitleFull: Impact of structural defects and hydronium ion concentration on the stability of zeolite BEA in aqueous phase.
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            NameFull: Shi, Hui
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              Text: Dec2018
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              Y: 2018
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