Atomically Dispersed Reduced Graphene Aerogel-Supported Iridium Catalyst with an Iridium Loading of 14.8 wt

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...

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Bibliographic Details
Published in:ACS catalysis 2019-11, Vol.9 (11), p.9905-9913
Main Authors: Babucci, Melike, Sarac Oztuna, F. Eylul, Debefve, Louise M, Boubnov, Alexey, Bare, Simon R, Gates, Bruce C, Unal, Ugur, Uzun, Alper
Format: Article
Language:English
Subjects:
atomic dispersion
Catalysis
catalyst
General Chemistry
graphene
high metal loading
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
iridium
noble metal
single-site
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Summary: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.
ISSN:2155-5435
2155-5435
DOI:10.1021/acscatal.9b02231