Characterization of Silica-Supported Tungsten Bis- and Tris-hydrides by Advanced Solid-State NMR
Type
ArticleAuthors
Wackerow, WiebkeThiam, Zeynabou

Abou-Hamad, Edy
Almaksoud, Walid
Hedhili, Mohamed N.

Basset, Jean-Marie

KAUST Department
Chemical Science ProgramPhysical 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
2021-06-03Online Publication Date
2021-06-03Print Publication Date
2021-06-17Embargo End Date
2022-06-03Submitted Date
2021-04-23Permanent link to this record
http://hdl.handle.net/10754/669399
Metadata
Show full item recordAbstract
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.1c03625Sponsors
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)Additional Links
https://pubs.acs.org/doi/10.1021/acs.jpcc.1c03625ae974a485f413a2113503eed53cd6c53
10.1021/acs.jpcc.1c03625