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Origin of Size-Dependent Reactivity of Nickel Cluster Ions with Methanol

机译:镍团簇离子与甲醇的尺寸相关反应性的起源

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摘要

Optimized structures of nickel cluster ions, Ni_n~+ (n = 2-8), were obtained by use of the density functional method. In comparison with the reaction of a methanol molecule with Ni_n~+ (chemisorption, demethanation and carbide formation), it is revealed that (1) the total reaction (mainly chemisorption) cross section is anti-correlated to the HOMO-LUMO gap of Ni_n~+ and (2) the selectivity of the carbide formation against the demethanation is determined by a propensity, "d-vacancy" (the number of the d-holes per atom); the demethanation proceeds selectively on Ni_n~+ with a d-vacancy of less than about 1.1 and the carbide formation otherwise.
机译:利用密度泛函方法获得了最佳的镍团簇离子结构Ni_n〜+(n = 2-8)。与具有Ni_n〜+的甲醇分子的反应(化学吸附,脱甲烷化和碳化物形成)相比,发现(1)整个反应(主要是化学吸附)横截面与Ni_n的HOMO-LUMO间隙反相关。 〜+和(2)碳化物对脱甲烷的选择性是由倾向“ d-空位”(每个原子的d-孔数)决定的;脱甲烷作用是在Ni_n〜+上选择性地进行的,其d空位小于约1.1,否则形成碳化物。

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