• Login
    View Item 
    •   Home
    • Research
    • Articles
    • View Item
    •   Home
    • Research
    • Articles
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of KAUSTCommunitiesIssue DateSubmit DateThis CollectionIssue DateSubmit Date

    My Account

    Login

    Quick Links

    Open Access PolicyORCID LibguidePlumX LibguideSubmit an Item

    Statistics

    Display statistics

    Tungsten Catalyst Incorporating a Well-Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)2 Al−O−W(≡Ct Bu) (H)2 ]

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    FINAL VERSION.pdf
    Size:
    1.133Mb
    Format:
    PDF
    Description:
    Accepted Manuscript
    Download
    Type
    Article
    Authors
    Werghi, Baraa cc
    Bendjeriou-Sedjerari, Anissa
    Jedidi, Abdesslem
    Morlanes, Natalia Sanchez cc
    Abou-Hamad, Edy
    Bhatte, Kushal Deepak cc
    Guan, Erjia
    Ma, Tao
    Aguilar-Tapia, Antonio
    Ould-Chikh, Samy cc
    Cavallo, Luigi cc
    Gates, Bruce C.
    Basset, Jean-Marie cc
    KAUST Department
    Chemical Science Program
    Core Labs
    Imaging and Characterization Core Lab
    KAUST Catalysis Center (KCC)
    NMR
    Physical Science and Engineering (PSE) Division
    Technology Transfer
    Date
    2018-12-21
    Online Publication Date
    2018-12-21
    Print Publication Date
    2019-01-09
    Permanent link to this record
    http://hdl.handle.net/10754/631591
    
    Metadata
    Show full item record
    Abstract
    A well-defined aluminium-bound hydroxyl group on the surface of mesoporous SBA-15, [(≡Si−O−Si≡) (≡Si−O) Al−OH], 3 was obtained by reacting di-isopropyl aluminium hydride with SBA-15 treated at 700 °C. The resulting surface [(≡Si−O−Si≡) (≡Si−O) Al (isobutyl) fragment undergoes β-H elimination at 400 °C leading to [(≡Si−O−Si≡)(≡Si−O−)Al−O) Al−H]. Further oxidation of this Al-hydride with NO leads to 3. This acidic support was used to create a well-defined surface organo-tungsten fragment [(≡Si−O−Si≡)(≡Si−O−)Al−O−W(≡CtBu)(CHtBu)] by reacting 3 with W(≡C-tBu)(CH-tBu). A further reaction with hydrogen under mild conditions afforded the tungsten carbyne bis-hydride [(≡Si−O−Si≡)(≡Si−O−)Al−O−W(H)(≡C-tBu)]. The performance of each of the W-supported catalysts was assessed for propane metathesis in a flow reactor at 150 °C. [(≡Si−O−Si≡)(≡Si−O−) Al−O−W(≡CtBu)(H)] was found to be a single-site catalyst, giving the highest turnover number (TON=800) and the highest reported selectivity for butane (45 %) vs. ethane (32 %) known for oxide-supported tungsten complex catalysts (with the supports being silica, silica-alumina, and alumina). The results demonstrate that modification of the oxide ligands on silica via the creation of Al Lewis acid center as an anchoring site for organometallic complexes opens up new catalytic properties, markedly enhancing the catalytic performance of supported organo-tungsten species.
    Citation
    Werghi B, Bendjeriou-Sedjerari A, Jedidi A, Morlanes N, Abou-Hamad E, et al. (2018) Tungsten Catalyst Incorporating a Well-Defined Tetracoordinated Aluminum Surface Ligand for Selective Metathesis of Propane, [(≡Si−O−Si≡)(≡Si−O−)2 Al−O−W(≡Ct Bu) (H)2 ]. ChemCatChem 11: 614–620. Available: http://dx.doi.org/10.1002/cctc.201801779.
    Sponsors
    The research was supported by the King Abdullah University of Science and Technology and by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Grant DE-FG02-04ER15513. We acknowledge the European Synchrotron Radiation Facility for providing synchrotron radiation facilities. L.C. and A. J. are grateful to the KAUST Supercomputing Laboratory for the resources. A. J. thank High-Performance Computing Center (AZIZ supercomputer) for the support.
    Publisher
    Wiley
    Journal
    ChemCatChem
    DOI
    10.1002/cctc.201801779
    Additional Links
    https://onlinelibrary.wiley.com/doi/full/10.1002/cctc.201801779
    ae974a485f413a2113503eed53cd6c53
    10.1002/cctc.201801779
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

    entitlement

     
    DSpace software copyright © 2002-2021  DuraSpace
    Quick Guide | Contact Us | Send Feedback
    Open Repository is a service hosted by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items. For anonymous users the allowed maximum amount is 50 search results.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.