Helium Separation Using Porous Graphene Membranes
Helium Separation Using Porous Graphene Membranes
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DOI：
10.1021/jz100748x
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发表时间：
2010-07
影响因子：
5.7
通讯作者：
Joshua Schrier
中科院分区：
文献类型：
--
作者：
Joshua Schrier
石墨烯已被证明是不透气的，但可以通过引入孔来选择性地渗透。使用MP2/cc-pVTZ势能面研究了最近合成的多孔石墨烯结构对He，Ne和CH 4的渗透性。量子和经典传输效应作为温度的函数的作用进行了研究。在室温下，有一个20%和16%的传输增加，由于量子隧穿的3 He和4 He，分别超过纯经典的结果。经典的势垒高度传输通过该膜（0.523，1.245，和4.832 eV的He，Ne，和CH 4，分别）的大的差异允许高选择性分离。这被提议作为从天然气中存在的其他稀有气体和烷烃中分离He的经济手段。
Graphene has been demonstrated to be impermeable to gases but can be made selectively permeable by introduction of pores. The permeability of a recently synthesized porous graphene structure to He, Ne, and CH4 is studied using MP2/cc-pVTZ potential energy surfaces. The role of quantum and classical transmission effects as a function of temperature are investigated. At room temperature, there is a 20 and 16% increase in transmission due to quantum tunneling for 3He and 4He, respectively, over the purely classical result. The large differences in classical barrier heights for transmission through this membrane (0.523, 1.245, and 4.832 eV for He, Ne, and CH4, respectively) allow for highly selective separation. This is proposed as an economical means of separating He from the other noble gases and alkanes present in natural gas.