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    Characterization of Silica-Supported Tungsten Bis- and Tris-hydrides by Advanced Solid-State NMR

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    Type
    Article
    Authors
    Wackerow, Wiebke
    Thiam, Zeynabou cc
    Abou-Hamad, Edy
    Almaksoud, Walid
    Hedhili, Mohamed N. cc
    Basset, Jean-Marie cc
    KAUST Department
    Chemical Science Program
    Physical Science and Engineering (PSE) Division
    Imaging and Characterization Core Lab
    NMR
    KAUST Catalysis Center (KCC)
    Surface Science
    KAUST Grant Number
    BAS/1/1326-01-01.
    Date
    2021-06-03
    Online Publication Date
    2021-06-03
    Print Publication Date
    2021-06-17
    Embargo End Date
    2022-06-03
    Submitted Date
    2021-04-23
    Permanent link to this record
    http://hdl.handle.net/10754/669399
    
    Metadata
    Show full item record
    Abstract
    Tungsten-hydrides supported on oxide supports are unique catalysts regarding the direct transformation of ethylene to propylene, alkane metathesis, and the low-temperature hydrogenolysis of waxes to lower molecular paraffins. The number of hydrides coordinated to the tungsten center and their structure on the siliceous support with very high surface silica (KCC-1) is unknown. KCC-1(700) silica of extremely high surface area allows for a high tungsten metal loading of 14 wt %. We show here the full characterization of supported tungsten bis- and tris-hydrides, which, after reaction with N2O gas, yield well-defined tungsten bis- and tris-hydroxide species on KCC-1(700). The obtained tungsten-hydroxide species are perfectly suitable for a detailed NMR study. The obtained tungsten hydroxo complexes are proven to be a tungsten bis-hydroxo and tungsten tris-hydroxo species. This analysis supports the conclusion that supported tungsten-hydride complexes coexist on the support as bis-hydride and tris-hydride species. They are, respectively, in close proximity to the silicon bis-hydride and the silicon mono-hydride. This proximity is explained by the mechanism of the formation of tungsten-hydride on the silica surface.
    Citation
    Wackerow, W., Thiam, Z., Abou-Hamad, E., Al Maksoud, W., Hedhili, M. N., & Basset, J.-M. (2021). Characterization of Silica-Supported Tungsten Bis- and Tris-hydrides by Advanced Solid-State NMR. The Journal of Physical Chemistry C. doi:10.1021/acs.jpcc.1c03625
    Sponsors
    We would like to acknowledge King Abdullah University of Science and Technology for funding. We also acknowledge KAUST NMR core lab for their continuous help. We acknowledge as well the KAUST Imaging Core Lab, particularly Dr. Alessandro Genovese.
    King Abdullah University of Science and Technology: BAS/1/1326-01-01.
    Publisher
    American Chemical Society (ACS)
    Journal
    The Journal of Physical Chemistry C
    DOI
    10.1021/acs.jpcc.1c03625
    Additional Links
    https://pubs.acs.org/doi/10.1021/acs.jpcc.1c03625
    ae974a485f413a2113503eed53cd6c53
    10.1021/acs.jpcc.1c03625
    Scopus Count
    Collections
    Articles; Imaging and Characterization Core Lab; Physical Science and Engineering (PSE) Division; Chemical Science Program; KAUST Catalysis Center (KCC)

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