Enhanced Catalytic Activity of High-Index Faceted Palladium Nanoparticles in Suzuki鈥揗iyaura Coupling Due to Efficient Leaching Mechanism
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- 作者：Gillian Collins ; Michael Schmidt ; Colm O鈥橠wyer ; Gerard McGlacken ; Justin D. Holmes
- 刊名：ACS Catalysis
- 出版年：2014
- 出版时间：September 5, 2014
- 年：2014
- 卷：4
- 期：9
- 页码：3105-3111
- 全文大小：401K
- ISSN：2155-5435
文摘
The structure鈥損roperty relationship of palladium (Pd) catalysts in Suzuki鈥揗iyaura 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 {100} 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.r>