Stabilizer-Free CuIr Alloy Nanoparticle Catalysts
Stabilizer-Free CuIr Alloy Nanoparticle Catalysts
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DOI：
10.1021/acs.chemmater.9b04138
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发表时间：
2019-11
影响因子：
8.6
通讯作者：
Hongyu Guo;Hao Li;D. Fernández;S. Willis;K. Jarvis;G. Henkelman;S. M. Humphrey
中科院分区：
文献类型：
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作者：
Hongyu Guo;Hao Li;D. Fernández;S. Willis;K. Jarvis;G. Henkelman;S. M. Humphrey
我们提出了直接合成无稳定剂的Cu-Ir合金纳米粒子（NPs）与可调的组合物。Cu和Ir在本体中是经典不混溶的。因此，铜铱合金的物理和催化性能在很大程度上是未知的。一种方便的微波辅助方法利用容易获得的Cu 2+盐和IrCl 3在改性的多元醇反应; NaOH促进快速溶剂辅助共还原产生CuxIr（100-x）NP，其中x可以在大约10-50的范围内变化。所合成的NP形成小的（约2nm）和接近单分散的立方八面体的稳定分散体，而不需要有机稳定剂（封端剂），从而产生直接适合于多相催化的纳米结构。负载在介孔Co 3 O 4上的CuxIr（100-x）NPs对巴豆醛的选择性部分氢化显示出高选择性，在气相中产生>40%的巴豆醇。对C → O和C → C键氢化的选择性对Cu：Ir的范围很不敏感。
We present the direct synthesis of stabilizer-free Cu–Ir alloy nanoparticles (NPs) with tunable compositions. Cu and Ir are classically immiscible in the bulk. Therefore, the physical and catalytic properties of Cu–Ir alloys are largely unknown. A convenient microwave-assisted method utilizes readily available Cu2+ salts and IrCl3 in a modified polyol reaction; NaOH facilitates rapid solvent-assisted coreduction to yield CuxIr(100–x)NPs, where x can be varied within the approximate range 10–50. The as-synthesized NPs form stable dispersions of small (∼2 nm) and near-monodisperse cuboctahedra without the requirement of organic stabilizing (capping) agents, resulting in nanostructures that are directly amenable to heterogeneous catalysis. CuxIr(100–x)NPs supported on mesoporous Co3O4 show high selectivity toward the selective partial hydrogenation of crotonaldehyde to yield >40% crotyl alcohol in the vapor phase. The selectivity toward C═O versus C═C bond hydrogenation is largely insensitive to the Cu:Ir ra...