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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >H2S Reactivity on Oxygen-Deficient Heterotrimetallic Cores: Cluster Fluxionality Simulates Dynamic Aspects of Surface Chemical Reactions
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H2S Reactivity on Oxygen-Deficient Heterotrimetallic Cores: Cluster Fluxionality Simulates Dynamic Aspects of Surface Chemical Reactions

机译:缺氧杂三金属核上的H2S反应性:团簇流动性模拟表面化学反应的动态方面

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Understanding the mechanistic aspects of heterogeneous reactions on supported metal catalysts is challenging due to several disparate factors, among which the dynamic nature of the surface is a major contributor. In this study, the dynamic aspect of a surface has been probed by choosing small metal clusters as illustrative models. Two anionic hetero-trimetallic clusters, namely, W2TcO6- and W2OsO6-, were reacted with H2S gas to exhibit splitting of the gas molecule and complete oxygen sulfur exchange in the metal core. During this atom-exchange process, the core exhibits remarkable fluxionality to augment a thiol proton migration from one metal center to another, as well as a rapid interchange of the terminal and bridging oxygens. The fluxional nature of the core is further evidenced by two oppositely oriented oxo groups working in concert to accomplish the proton transfer; upon introduction of sulfur inside the core. These fluxional processes in the small hetero-trimetallic cores closely resemble the dynamic nature of the surface in a heterogeneous reaction. Throughout the fluxional processes investigated in this study, two state reactivity and multiple instances of spin crossover are observed in our computational studies. Interestingly, the neutral hetero-trimetallic cores can also undergo complete oxygen sulfur exchange reaction with H2S. The investigated metal clusters are promising materials, since they not only can liberate dihydrogen from water (reported in J. Phys. Chem. A, 2014, 118, 11047) but also can completely strip the sulfur from environmentally hazardous H2S gas.
机译:由于几种不同的因素,要了解负载型金属催化剂上多相反应的机理是具有挑战性的,其中表面的动态性质是主要因素。在这项研究中,通过选择小的金属团簇作为说明模型来探讨表面的动态方面。两个阴离子杂三金属簇,即W2TcO6-和W2OsO6-与H2S气体反应,展现出气体分子的分裂,并在金属核中完成了氧硫交换。在这种原子交换过程中,核表现出显着的流动性,以增强硫醇质子从一个金属中心向另一个金属中心的迁移,以及末端氧和桥接氧的快速交换。两个相反方向的氧代基团协同工作以完成质子转移,进一步证明了核的通量性质。在芯内引入硫时。在小的异质三金属核中的这些通量过程非常类似于异质反应中表面的动态性质。在本研究中研究的整个通量过程中,在我们的计算研究中观察到两种状态的反应性和自旋交叉的多种情况。有趣的是,中性杂三金属核还可以与H2S进行完全的氧硫交换反应。被研究的金属簇是有前途的材料,因为它们不仅可以从水中释放出二氢(J. Phys。Chem。A,2014,118,11047中报道),而且可以从对环境有害的H2S气体中完全脱除硫。

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