对二氧化碳膜分离的热结构进行大规模选
Jihan Kim1, Mahmoud Abouelnasr, Li-Chiang Lin
1Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA. jihankim@lbl.gov
Journal of the American Chemical Society
|May 10, 2013
概括
我们选了超过87,000个化物结构,检查二氧化碳 (CO2) 与甲 (CH4) 或 (N2) 的分离. 我们的先进模拟确定了最佳的热解质,其性能高达现有材料的7倍.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 计算化学计算化学
背景情况:
- 热质石对于气体分离膜至关重要.
- 开发用于CO2/CH4和CO2/N2分离的高性能热石对于工业应用至关重要.
- 现有的热石选方法往往耗时且范围有限.
研究的目的:
- 进行大规模的选,以检测二氧化材料的CO2/CH4和CO2/N2膜分离.
- 开发一种基于吸附和扩散性质的新型指标来排名热带石的性能.
- 为了确定气体分离和反向分离过程的最佳热带石结构.
主要方法:
- 利用分子模拟来分析热石孔内的客分子的自由能量场景.
- 开发了一种高效的算法,利用图形处理单元 (GPU) 快速表征吸附和扩散特性.
- 与性能指标对比,选了超过87,000个石结构,包括已知的IZA结构.
主要成果:
- 确定了具有均分布的吸附点的最佳热带石结构,平衡了二氧化碳吸附和扩散.
- 发现表现最好的预测热石比已知的热石表现更好,表现为4-7倍.
- 发现了用于直接CO2/CH4或CO2/N2分离和逆流程的不同组合的最佳热利石.
结论:
- 先进的分子模拟和高效的算法可以加快发现高性能热带石膜的速度.
- 开发的选方法为设计特定气体分离需求的材料提供了强大的工具.
- 这项研究扩大了针对性气体分离的热石结构性质关系的理解.
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