Remarkable NO oxidation on single supported platinum atoms.

Remarkable NO oxidation on single supported platinum atoms.
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DOI:
10.1038/srep07238
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发表时间:
2014-11-28
期刊:
影响因子:
4.6
通讯作者:
Moses-DeBusk M
Moses-DeBusk M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Narula CK;Allard LF;Stocks GM;Moses-DeBusk M

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我们的第一性原理密度泛函理论模型表明,NO氧化是可行的完全氧化的单一θ-Al 2 O3负载铂原子通过修改的Langmuir-Hinshelwood途径。这与已知的负载型铂的NO氧化活性随着Pt粒度减小而降低形成对比,据信这是由于铂氧化增加。为了验证我们的理论研究,我们评估了单一的θ-Al 2 O3负载铂原子,发现它们表现出显着的NO氧化活性。的周转频率(TOF)的比较单载铂原子与铂颗粒的NO氧化表明,单载铂原子的活性完全形成的铂颗粒。因此,NO氧化负载Pt上的整体画面是,NO氧化活性随着Pt颗粒尺寸的减小而降低,但当Pt仅以单原子存在时加速。
Our first-principles density functional theoretical modeling suggests that NO oxidation is feasible on fully oxidized single θ-Al2O3 supported platinum atoms via a modified Langmuir-Hinshelwood pathway. This is in contrast to the known decrease in NO oxidation activity of supported platinum with decreasing Pt particle size believed to be due to increased platinum oxidation. In order to validate our theoretical study, we evaluated single θ-Al2O3 supported platinum atoms and found them to exhibit remarkable NO oxidation activity. A comparison of turnover frequencies (TOF) of single supported Pt atoms with those of platinum particles for NO oxidation shows that single supported Pt atoms are as active as fully formed platinum particles. Thus, the overall picture of NO oxidation on supported Pt is that NO oxidation activity decreases with decreasing Pt particle size but accelerates when Pt is present only as single atoms.
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期刊: PHYSICAL REVIEW B
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