Computer simulation studies on gas permeation through nanoporous carbon membranes by non-equilibrium molecular dynamics

被引:41
作者
Furukawa, S [1 ]
Nitta, T [1 ]
机构
[1] OSAKA UNIV, FAC ENGN SCI, DEPT CHEM ENGN, TOYONAKA, OSAKA 560, JAPAN
关键词
membrane molecular dynamics; non-equilibrium; methane; ethane;
D O I
10.1252/jcej.30.116
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The mu VT-NEMD method, a combination of the mu VT-MC and the boundary-driven non-equilibrium MD, has been applied for simulating permeation of pure- and mixed-gases through membranes with slit-like pores under the assumption of local adsorption equilibrium with the feed gas al the entrance of the membrane. The model system is a slit-like pore of graphite plane for the membrane and the methane and the ethane for permeating gases. To reach the stationary state in a simulation run, 50,000-60,000 time steps computation and 500-2,000 molecules in a cell are required for obtaining better statistics in the NEMD. Computer graphics animations clearly show that molecules having entered the pore gather together in monolayers on the surface to form downstream surface flow. Under a constant feed pressure condition, the mass fluxes of gases decrease significantly with increasing temperature because of the decrease in pore density in adsorption equilibrium with a feed gas. In the case of binary mixture permeation, enhanced selectivity of more adsorptive substance (ethane) was observed with an decrease in temperature, the reason for which is the significant decrease in pore density of methane, a weaker adsorptive, due to the competitive adsorption of ethane.
引用
收藏
页码:116 / 122
页数:7
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