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Issue 4, 2017
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Silica-supported isolated gallium sites as highly active, selective and stable propane dehydrogenation catalysts

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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.

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

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Publication details

The article was received on 24 Nov 2016, accepted on 28 Dec 2016, published on 03 Jan 2017 and first published online on 03 Jan 2017


Article type: Edge Article
DOI: 10.1039/C6SC05178B
Citation: Chem. Sci., 2017,8, 2661-2666
  • Open access: Creative Commons BY-NC license
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    Silica-supported isolated gallium sites as highly active, selective and stable propane dehydrogenation catalysts

    K. Searles, G. Siddiqi, O. V. Safonova and C. Copéret, Chem. Sci., 2017, 8, 2661
    DOI: 10.1039/C6SC05178B

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