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arXiv 0812.2700cond-mat.mtrl-scicond-mat.other
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H2在原型金属有机骨架材料中结合的理论和实验分析

Theoretical and experimental analysis of H2 binding in a prototype metal organic framework material

Lingzhu Kong, Valentino R. Cooper, Nour Nijem, Kunhao Li, Jing Li, Yves J. Chabal, David C. Langreth

摘要:

采用实验和理论相结合的方法研究了金属有机骨架(MOF)结构Zn 2(BDC)2(TED)对氢的吸附。通过使用非经验范德华密度泛函(vdW-DF)方法,发现最深的H2结合位置的轨迹位于两种类型的窄通道。最稳定的结合位点的能量,以及这样的结合位点的数量,是一致的从实验吸附等温线和吸附热数据获得的值。当吸附在MOF中时,H-H伸缩频率的偏移的计算在两个通道中的每一个中的最强结合点处给出约-30 cm-1的值。室温红外吸收光谱测量给出了中心在4120 cm-1的氢峰,这意味着与理论计算一致的位移。

英文摘要:

Hydrogen adsorption by the metal organic framework (MOF) structure Zn2(BDC)2(TED) is investigated using a combination of experimental and theoretical methods. By use of the nonempirical van der Waals density-functional (vdW-DF) approach, it is found that the locus of deepest H2 binding positions lies within two types of narrow channel. The energies of the most stable binding sites, as well as the number of such binding sites, are consistent with the values obtained from experimental adsorption isotherms and heat of adsorption data. Calculations of the shift of the H-H stretch frequency when adsorbed in the MOF give a value of approximately -30 cm-1 at the strongest binding point in each of the two channels. Ambient temperature infrared absorption spectroscopy measurements give a hydrogen peak centered at 4120 cm-1, implying a shift consistent with the theoretical calculations.

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