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Electronic structure of atomically dispersed supported iridium catalyst controls iridium aggregation

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Hoffman, Adam S.
Akgül, Deniz
Babucci, Melike
Aviyente, Viktorya
Gates, Bruce C.
Bare, Simon R.

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Supported iridium complexes, Ir(C2H4)2/support, were characterized by X-ray absorption spectroscopy during a temperature ramp to 120 °C in flowing H2. Iridium in complexes bonded to weak and moderate electron-donor supports, SiO2and ?-Al2O3, underwent aggregation, forming nanoparticles and clusters, respectively. When the support was a strong electron-donor (MgO), iridium remained site-isolated. Density functional theory calculations confirm the dependence of iridium-support bond strength on the support's electron-donor character. Coating the SiO2-supported complexes with 1- n-ethyl-3-methyl-imidazolium acetate enhanced electron density on the iridium, hindering its aggregation. These results demonstrate opportunities for stabilizing atomically dispersed supported noble metals under reducing conditions by choice of support/ionic liquid sheath combinations.

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American Chemical Society (ACS)

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Chemistry

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ACS Catalysis

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10.1021/acscatal.0c03909

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