期刊
ACS CATALYSIS
卷 4, 期 9, 页码 3105-3111出版社
AMER CHEMICAL SOC
DOI: 10.1021/cs5008014
关键词
palladium nanocrystals; shape control nanoparticles; Suzuki coupling; leaching
资金
- Enterprise Ireland [EI2011-0139]
- Eli Lilly
- Science Foundation Ireland [08/CE/I1432]
- Science Foundation Ireland (SFI) [08/CE/I1432] Funding Source: Science Foundation Ireland (SFI)
The structure property relationship of palladium (Pd) catalysts in Suzuki-Miyaura cross-coupling reactions was investigated using Pd nanocrystals of uniform size and shape. Superior catalytic reactivity was observed for Pd nanoparticles with high-index {730} surface facets compared to low-index 000 facets. Although the nanocrystal morphologies were maintained during the reaction, the presence of Pd clusters, identified by high-resolution transmission electron microscopy (TEM), indicates a leaching mechanism. The nature of the surface facets on the nanoparticles was observed to influence the rate of Pd leaching during the Suzuki coupling reaction. The enhanced reactivity observed for the high-index facet catalysts stems from the greater number of leachable atoms of low abstraction energy available on high-index planes. KEYWORDS: palladium nanocrystals, shape control nanoparticles, Suzuki coupling, leaching
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