期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 16, 页码 4142-4145出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201400483
关键词
heterogeneous catalysis; palladium; surface facet; Suzuki-Miyaura coupling
资金
- Enterprise Ireland [EI2011-023]
- Eli Lilly
The shape sensitivity of Pd catalysts in Suzuki-Miyaura coupling reactions is studied using nanocrystals enclosed by well-defined surface facets. The catalytic performance of Pd nanocrystals with cubic, cuboctahedral and octahedral morphologies are compared. Superior catalytic reactivity is observed for Pd NCs with {100} surface facets compared to {111} facets. The origin of the enhanced reactivity associated with a cubic morphology is related to the leaching susceptibility of the nanocrystals. Molecular oxygen plays a key role in facilitating the leaching of Pd atoms from the surface of the nanocrystals. The interaction of O-2 with Pd is itself facet-dependent, which in turn gives rise to more efficient leaching from {100} facets, compared to {111} facets under the reaction conditions.
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