Journal
CATALYSIS SCIENCE & TECHNOLOGY
Volume 9, Issue 23, Pages 6570-6576Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9cy01442j
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Funding
- U.S. Department of Energy (DOE) [DE-AC05-76RL01830]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences, Division of Chemical Sciences, Biosciences, and Geosciences
- DOE's Office of Biological and Environmental Research
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The homolytic activation of the strong CH bonds in ethylene is demonstrated, for the first time, on d(8) Ir(I) and Ni(II) single atoms in the cationic positions of zeolites H-FAU and H-BEA under ambient conditions. The oxidative addition of C2H4 to the metal center occurs with the formation of a d(6) metal vinyl hydride, explaining the initiation of the olefin-polymerization cycle on d(8) M(I/II) sites in the absence of pre-existing M-H bonds. Under mild reaction conditions (80-220 degrees C, 1 bar), the catalytic dimerization to butenes and dehydrogenative coupling of ethylene to butadiene occurs over these catalysts. 1-Butene is not converted to butadiene under the reaction conditions applied. Post-reaction characterization of the two materials reveals that the active metal cations remain site-isolated whereas deactivation occurs due to the formation of carbonaceous deposits on the zeolites. Our findings have significant implications for the molecular level understanding of ethylene conversion and the development of new ways to functionalize C-H bonds under mild conditions.
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