在预测以太/乙烯的吸附性质方面达到量子准确性,在低压状态下在氧化伊米达酸框架-8中预测以太/乙烯的吸附性质
Siddharth Ravichandran1, Mahsa Najafi2, Ruben Goeminne1
1Center for Molecular Modeling (CMM), Ghent University, Technologiepark 46, Zwijnaarde 9052, Belgium.
Journal of chemical theory and computation
|June 10, 2024
概括
我们开发了使用模拟的新方法,准确预测ZIF-8等纳米孔材料中的碳化合物吸附. 我们的方法改进了力场以更好地与实验数据一致,改善了分离预测.
科学领域:
- 材料科学 材料科学 材料科学
- 计算化学计算化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 纳米孔状材料,如热性伊米达酸框架-8 (ZIF-8),显示出对碳化合物混合物分离的前景.
- 大法典的蒙特卡洛模拟对于计算这些材料中的吸附同热量是有价值的.
- 在模拟中使用的电流力场往往在低压下产生不准确的吸附预测.
研究的目的:
- 开发和验证新的方法来准确预测ZIF-8.8中的吸附剂-吸附剂相互作用.
- 在低压状态下对现有强力场的吸附性能进行基准测试.
- 改进力场参数,以改善模拟和实验性吸附等热体之间的一致性.
主要方法:
- 开发了一种基于比较力场衍生的亨利系数与使用PBE-MBD和重要性抽样计算的参考值的基准测试方法.
- 创建了一个改进程序,以重新调整力场参数,以便更好地描述主机-客户互动.
- 使用ZIF-8/乙烯和ZIF-8/乙烯系统的验证方法.
主要成果:
- 基准测试方法精确地根据它们的低压吸附性能对力场进行排名.
- 精细化程序显著提高了UFF/TraPPE力场的准确性.
- 对于UFF/TraPPE的摄入差异从190%以上减少到11-21%的乙和乙烯.
结论:
- 拟议的方法允许准确预测纳米孔质材料中的吸附.
- 在没有实验数据的情况下,重新缩放的力场可以达到接近量子的准确性.
- 这项工作为优化纳米孔质材料用于气体分离提供了一条途径.
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