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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Oxidation of CO by nickel oxide clusters revealed by post heating
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Oxidation of CO by nickel oxide clusters revealed by post heating

机译：后加热显示氧化镍团簇氧化一氧化碳

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摘要

Reactions of nickel oxide cluster ions, Ni_nO_(n+x)~+ (n = 4-10, x = -1～+3), with CO in a He buffer gas were investigated using mass spectrometry. When the cluster ions react at room temperature, a CO molecule tends to attach readily to Ni_nO_(n+x)~+ for all of the cluster ions with different stoichiometry, although rate constants of the CO attachment reaction are more or less stoichiometry-dependent. However, CO was found to be released from the cluster ions when the cluster ions were heated up to 523 K after the reaction. This finding is interpreted such that the CO molecule that physisorbs weakly to Ni_nO_(n+x)~+ at room temperature desorbs into the gas phase by the post heating. In addition, we found that an oxygen extraction reaction by a CO molecule actually occurs for oxygen-rich clusters such as Ni_6O_7~+ and Ni_8O_9~+. As the oxygen extraction reaction is one order of magnitude slower than physisorption, it lies hidden underneath of the faster physisorption processes in the mass spectrum but is revealed by the elimination of physisorption through the post heating.
机译：利用质谱研究了Ni缓冲气体中Ni_nO_（n + x）〜+（n = 4-10，x = -1〜+ 3）与CO的反应。当簇离子在室温下反应时，尽管CO附着反应的速率常数或多或少地依赖于化学计量，但对于所有化学计量不同的簇离子，CO分子都易于附着在Ni_nO_（n + x）〜+上。 。但是，发现在反应后将簇离子加热至523 K时，CO从簇离子中释放。该发现被解释为使得在室温下物理吸附至Ni_nO_（n + x）〜+的CO分子通过后加热而解吸成气相。另外，我们发现对于诸如Ni_6O_7〜+和Ni_8O_9〜+之类的富氧簇实际上发生了由CO分子进行的氧提取反应。由于氧气萃取反应比物理吸附慢一个数量级，因此它隐藏在质谱中更快的物理吸附过程的下方，但通过后加热消除了物理吸附而得以揭示。

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