Silica-supported isolated gallium sites as highly active, selective and stable propane dehydrogenation catalysts

Open access
Date
2017-04-01Type
- Journal Article
Citations
Cited 76 times in
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Cited 76 times in
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Abstract
Single-site gallium centers on the surface of silica are prepared via grafting of [Ga(OSi(OtBu)3)3(THF)] on SiO2–700 followed by a thermolysis step. The resulting surface species corresponds to well-defined tetra-coordinate gallium single-sites, [([triple bond, length as m-dash]SiO)3Ga(XOSi[triple bond, length as m-dash])] (X = –H or [triple bond, length as m-dash]Si) according to IR, X-ray absorption near-edge structure and extended X-ray absorption fine structure analysis. These gallium sites show high activity, selectivity and stability for propane dehydrogenation with an initial turnover frequency of 20 per h per gallium center, propylene selectivity of ≥93% and remarkable stability over 20 h. The stability of the catalyst probably results from site-isolation of the active site on a non-reducible support such as silica, diminishing facile reduction typical of Ga2O3-based catalysts. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000130343Publication status
publishedExternal links
Journal / series
Chemical ScienceVolume
Pages / Article No.
Publisher
Royal Society of ChemistryOrganisational unit
03872 - Copéret, Christophe / Copéret, Christophe
Funding
149704 - Understanding and Controlling the Interface of Supported Catalysts (SNF)
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Citations
Cited 76 times in
Web of Science
Cited 76 times in
Scopus
ETH Bibliography
yes
Altmetrics