Hydrogen thermal desorption spectra: insights from molecular simulation.

Hydrogen thermal desorption spectra: insights from molecular simulation.
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氢热解吸光谱:来自分子模拟的见解。

DOI:
10.1039/c2dt12003h
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发表时间:
2012
期刊:
2003)
影响因子:
--
通讯作者:
Prosenjak C
Prosenjak C
中科院分区:
--
文献类型:
--
作者:
Prosenjak C

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使用大正则蒙特卡罗模拟研究了许多金属有机骨架的热解吸光谱。我们的模拟结果与实验结果定性一致,但也表明在选择力场来描述氢/骨架相互作用时必须非常小心。由于模拟还产生了吸附分子的位置和势能,因此可以直接将热解吸光谱中的峰和特征分配给特定的吸附位点。我们表明,峰的位置与氢-骨架相互作用直接相关,氢-骨架相互作用是孔隙空间的化学和拓扑环境、孔径以及特定相互作用位点(例如开放金属位点)的存在的复杂函数。最后,我们证明,用于获得实验热脱附光谱的 IRMOF-8 样品确实如之前所怀疑的那样被连接。总体而言,分子模拟是补充实验热解吸光谱解释的有用工具。
Thermal desorption spectra of a number of metal–organic frameworks were studied using grand canonical Monte Carlo simulation. Our simulation results are in qualitative agreement with experimental results but also show that great care must be taken when choosing the force field to describe the hydrogen/framework interaction. As the simulations additionally yield the positions and potential energies of the adsorbed molecules it is straightforward to assign the peaks and features in the thermal desorption spectra to specific adsorption sites. We show that the location of the peaks is directly related to the hydrogen–framework interaction which is a complex function of the chemical and topological environment of the pore space, the pore size and the presence of specific interaction sites such as open metal sites. Finally, we demonstrate that an IRMOF-8 sample used to obtain an experimental thermal desorption spectrum must have indeed been catenated as previously suspected. Overall, molecular simulation is a useful tool to complement the interpretation of experimental thermal desorption spectra.
通过结合密度泛函理论和分子力学方法准确预测具有不饱和金属位点的金属有机框架中的氢吸附
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