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17865916105

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[求助] Remarkable NO oxidation on single supported platinum atoms

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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ak47aug

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爱与雨下: 金币+1 2017-04-21 06:22:28
17865916105(fjtony163代发): 金币+50, 代发 2017-05-25 09:09:25
fjtony163: 翻译EPI+1, 代发 2017-05-25 09:09:34
我们的第一原理密度泛函理论模型表明,NO通过改良的Langmuir-Hinshelwood途径氧化过程可以在完全氧化的单一θ-Al2O3负载的铂原子上发生。 这与已知的负载铂的NO氧化活性的降低相反,铂的氧化活性随Pt浓度的降低被认为是由于增加的铂氧化。 为了验证我们的理论研究,我们评估了单一的θ-Al2O3负载铂原子,发现它们表现出显着的NO氧化活性。 单个负载的Pt原子的转化频率(TOF)与用于NO氧化的铂颗粒的转换频率的比较表明,单个负载的Pt原子与完全形成的铂颗粒一样具有活性。 因此,负载Pt上的NO氧化的总体情况是NO氧化活性随着Pt粒径的减小而降低,但当Pt仅作为单个原子存在时加速。
2楼2017-04-19 18:19:14
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