期刊
ACS NANO
卷 8, 期 11, 页码 11512-11521出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn504746u
关键词
alloy nanoparticles; microwave synthesis; heterogeneous catalysis; immiscible alloys; density functional theory (DFT); hydrogenation
类别
资金
- Welch Foundation [F-1738, F-1841]
- U.S. Department of Energy [DE-FG02-13ER16428]
Noble metal alloys are important in large-scale catalytic processes. Alloying facilitates fine-tuning of catalytic properties via synergistic interactions between metals. It also allows for dilution of scarce and expensive metals using comparatively earth-abundant metals. RhAg and RhAu are classically considered to be immiscible metals. We show here that stable RhM (M = Ag, Au) nanoparticles with randomly alloyed structures and broadly tunable Rh:M ratios can be prepared using a microwave-assisted method. The alloyed nanostructures with optimized Rh:M compositions are significantly more active as hydrogenation catalysts than Rh itself: Rh is more dilute and more reactive when alloyed with Ag or Au, even though the latter are both catalytically inactive for hydrogenation. Theoretical modeling predicts that the observed catalytic enhancement is due to few-atom surface ensemble effects in which the overall reaction energy profile for alkene hydrogenation is optimized due to RhM d-band intermixing.
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