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Improving Stability of Zeolites in Aqueous Phase via Selective Removal of Structural Defects.

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Title: Improving Stability of Zeolites in Aqueous Phase via Selective Removal of Structural Defects.
Authors: Prodinger, Sebastian1, Derewinski, Miroslaw A.1 miroslaw.derewinski@pnnl.com, Vjunov, Aleksei1, Burton, Sarah D.1, Arslan, Ilke1, Lercher, Johannes A.1,2 Johannes.Lercher@pnnl.gov
Source: Journal of the American Chemical Society. 4/6/2016, Vol. 138 Issue 13, p4408-4415. 8p.
Subjects: Zeolites, Aqueous solutions, Chemical bonds, Molecular sieves, Sorption
Abstract: Missing silicon-oxygen bonds in zeolites are shown to be the cause for structural instability of zeolites in hot liquid water. Their selective removal drastically improved their structural stability as demonstrated using zeolite beta as example. The defects in the siloxy bonds were capped by reaction with trimethylchlorosilane, and Si-O-Si bonds were eventually formed. Hydrolysis of Si-O-Si bonds of the parent materials and dissolution of silica-oxygen tetrahedra in water causing a decrease in sorption capacity by reprecipitation of dissolved silica and pore blocking was largely mitigated by the treatment. The stability of the modified molecular sieves was monitored by 29Si-MAS NMR, transmission electron micrographs, X-ray diffraction, and adsorption isotherms. The microporosity, sorption capacity, and long-range order of the stabilized material were fully retained even after prolonged exposure to hot liquid water. [ABSTRACT FROM AUTHOR]
Copyright of Journal of the American Chemical Society is the property of American Chemical Society 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: 114714932
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PubTypeId: academicJournal
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  Data: Improving Stability of Zeolites in Aqueous Phase via Selective Removal of Structural Defects.
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  Data: <searchLink fieldCode="AR" term="%22Prodinger%2C+Sebastian%22">Prodinger, Sebastian</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.com</i><br /><searchLink fieldCode="AR" term="%22Vjunov%2C+Aleksei%22">Vjunov, Aleksei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Burton%2C+Sarah+D%2E%22">Burton, Sarah D.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Arslan%2C+Ilke%22">Arslan, Ilke</searchLink><relatesTo>1</relatesTo><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="%22Journal+of+the+American+Chemical+Society%22">Journal of the American Chemical Society</searchLink>. 4/6/2016, Vol. 138 Issue 13, p4408-4415. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink><br /><searchLink fieldCode="DE" term="%22Aqueous+solutions%22">Aqueous solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+bonds%22">Chemical bonds</searchLink><br /><searchLink fieldCode="DE" term="%22Molecular+sieves%22">Molecular sieves</searchLink><br /><searchLink fieldCode="DE" term="%22Sorption%22">Sorption</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Missing silicon-oxygen bonds in zeolites are shown to be the cause for structural instability of zeolites in hot liquid water. Their selective removal drastically improved their structural stability as demonstrated using zeolite beta as example. The defects in the siloxy bonds were capped by reaction with trimethylchlorosilane, and Si-O-Si bonds were eventually formed. Hydrolysis of Si-O-Si bonds of the parent materials and dissolution of silica-oxygen tetrahedra in water causing a decrease in sorption capacity by reprecipitation of dissolved silica and pore blocking was largely mitigated by the treatment. The stability of the modified molecular sieves was monitored by 29Si-MAS NMR, transmission electron micrographs, X-ray diffraction, and adsorption isotherms. The microporosity, sorption capacity, and long-range order of the stabilized material were fully retained even after prolonged exposure to hot liquid water. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of the American Chemical Society is the property of American Chemical Society 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: 10.1021/jacs.5b12785
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 4408
    Subjects:
      – SubjectFull: Zeolites
        Type: general
      – SubjectFull: Aqueous solutions
        Type: general
      – SubjectFull: Chemical bonds
        Type: general
      – SubjectFull: Molecular sieves
        Type: general
      – SubjectFull: Sorption
        Type: general
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      – TitleFull: Improving Stability of Zeolites in Aqueous Phase via Selective Removal of Structural Defects.
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            NameFull: Prodinger, Sebastian
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            NameFull: Derewinski, Miroslaw A.
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            NameFull: Burton, Sarah D.
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              Text: 4/6/2016
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              Y: 2016
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