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Atomically dispersed reduced graphene aerogel-supported iridium catalyst with an iridium loading of 14.8 wt %

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Debefve, Louise M.
Boubnov, Alexey
Bare, Simon R.
Gates, Bruce C.

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Atomically dispersed iridium complexes were anchored on a reduced graphene aerogel (rGA) by the reaction of Ir(CO)(2)(acac) [acac = acetonylacetonato] with oxygen-containing groups on the rGA. Characterization by X-ray absorption, infrared, and X-ray photoelectron spectroscopies and atomic resolution aberration-corrected scanning transmission electron microscopy demonstrates atomically dispersed iridium, at the remarkably high loading of 14.8 wt %. The rGA support offers sites for metal bonding comparable to those of metal oxides, but with the advantages of high density and a relatively high degree of uniformity, as indicated by the same turnover frequencies for catalytic hydrogenation of ethylene at low and high iridium loadings. The atomic dispersion at a high metal loading- and the high density of catalytic sites per unit of reactor volume, a key criterion for practical catalysts-set this catalyst apart from those reported.

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American Chemical Society (ACS)

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Chemistry, Physical

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Acs Catalysis

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10.1021/acscatal.9b02231

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