Effect of Pd nanoparticle size on the catalytic hydrogenation of allyl alcohol
Effect of Pd nanoparticle size on the catalytic hydrogenation of allyl alcohol
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DOI：
10.1021/ja058217m
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发表时间：
2006-04-12
影响因子：
15
通讯作者：
Crooks, RM
中科院分区：
文献类型：
--
作者：
Wilson, OM;Knecht, MR;Crooks, RM
我们报告了使用1.3 - 1.9 nm Pd树枝状聚合物封装的纳米颗粒（DEN）催化剂对烯丙醇的氢化速率的粒度依赖性。对于直径<1.5 nm且含有<147个Pd原子的颗粒，催化活性的调节是由于颗粒的电子性质。对于直径为1.5 - 1.9 nm且平均含有147 - 250个Pd原子的较大颗粒，尺寸效应是几何约束的结果。具体而言，氢化反应优先发生在较大纳米颗粒的表面原子上。
We report a particle size dependence for the rate of hydrogenation of allyl alcohol using 1.3−1.9 nm Pd dendrimer-encapsulated nanoparticle (DEN) catalysts. For particles with diameters of <1.5 nm and containing <147 Pd atoms, the modulation in catalytic activity is due to the electronic properties of the particle. For the larger particles, 1.5−1.9 nm in diameter and containing an average of 147−250 Pd atoms, the size effect is a result of geometrical constraints. Specifically, the hydrogenation reaction is shown to occur preferentially on the face atoms of the larger nanoparticles.