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Highly Productive Propane Dehydrogenation Catalyst Using Silica-Supported Ga-Pt Nanoparticles Generated From Single-Sites.

Keith Searles, Ka Wing Chan, Jorge Augusto Mendes Burak, D. Zemlyanov, O. Safonova, C. Copéret
Published 2018 · Chemistry, Medicine

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The development of more effective alkane dehydrogenation catalysts is a key technological challenge for the production of olefins from shale gas, an abundant source of light hydrocarbons. Surface organometallic chemistry provides an original approach to generate nanometric Ga-Pt bimetallic particles supported on partially dehydroxylated silica containing gallium single-sites, which displays high activity, selectivity, and stability in propane dehydrogenation. This catalyst was prepared via sequential grafting of a platinum precursor onto silica possessing site-isolated gallium sites followed by H2 reduction. Monitoring generation of the reduced species, Gaδ+Pt0/SiO2, via in situ X-ray absorption spectroscopy reveals formation of a Ga xPt (0.5 < x < 0.9) alloy with a fraction of gallium remaining as isolated sites. This bimetallic material exhibits catalytic performance that far surpasses each of the individual components and other reported Ga-Pt based catalysts; this is attributed to the highly dispersed Ga xPt alloyed structure on a support with low Brønsted acidity containing gallium single-sites.
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