期刊
ACS CATALYSIS
卷 9, 期 11, 页码 9905-9913出版社
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.9b02231
关键词
single-site; catalyst; iridium; noble metal; graphene; high metal loading atomic dispersion
资金
- TUBITAK [217M547]
- U.S. DOE, Office of Science, Basic Energy Sciences (BES) [DE-FG02-04ER15513]
- TUBA-GEBIP Award
- Chevron
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
- Chemical Sciences Program, Chemical Sciences. Geosciences, and Biosciences Division, Basic Energy Sciences of the U.S. DOE Office of Science
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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