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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Adsroption and Reaction of Mehtanol Molecule on Nickel Cluster Ions,ni_n~+ (n=3-11)
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Adsroption and Reaction of Mehtanol Molecule on Nickel Cluster Ions,ni_n~+ (n=3-11)

机译:甲醇分子在镍团簇离子上的吸附和反应,a_n〜+(n = 3-11)

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摘要

The reactions of methanol on a size-selected nickel cluster ion, Ni~~ (n = 3—11), were invesiig~u energies less than 1.0 eV in a beam-gas geometry. Dominant reactions’ were methanol diem demethanation, and carbide formation. The absolute cross sections of these different reactions wa~ and found to change dramatically with the cluster size; the demethanation proceeds preferentially the carbide formation on Ni7,8~, and the chemisorption on Ni6~. A kinematic model explains the size-~~ characteristics that the chemisorption proceeds efficiently if the barrier height between the physiscxb~ ~ the chemisorbed states is low, and the demethanation and the carbide formation proceed otherwise. The i~ of the carbide formation depends sensitively on an Ni—Ni distance of Ni~+ so that it proceeds only on Ni_(7.8)~+.
机译:在束流气体几何结构中,甲醇在尺寸选择的镍簇离子Ni(n = 3-11)上的反应能量小于1.0 eV。主要反应是甲醇二甲甲烷脱甲烷和碳化物形成。这些不同反应的绝对横截面随簇大小的变化而急剧变化。脱甲烷作用优先在Ni7,8〜上进行碳化物的形成,而在Ni6〜上进行化学吸附。运动学模型解释了尺寸特征,即如果物理吸附状态之间的势垒高度低,则化学吸附有效地进行,否则脱甲烷和碳化物的形成就进行。碳化物形成的i〜敏感地取决于Ni〜+的Ni-Ni距离,因此它仅在Ni_(7.8)〜+上进行。

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