在多孔介质中的液相建模:在凝结水中的H-MFI中吸附甲醇和乙醇
Subrata Kumar Kundu1, Muhammad Zeeshan1, Panuwat Watthaisong1
1Department of Chemical Engineering, University of South Carolina, 301 South Main Street, Columbia, South Carolina 29208, United States.
Journal of chemical theory and computation
|June 11, 2025
概括
我们开发了一种新的明确溶解方法 (eSZS),以准确预测溶剂对热带石吸附的影响. 这种方法揭示了水破坏了H-MFI热中甲醇和乙醇吸附的稳定性.
科学领域:
- 计算化学的计算化学
- 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.
背景情况:
- 由于其吸附性质,石在化学和分离工业中至关重要.
- 准确预测溶剂对化物中吸附的影响是具有挑战性的.
- 隐式溶解模型和经典力场对多孔材料有局限性.
研究的目的:
- 开发一种明确的溶解方法 (eSZS),用于预测溶剂/凝结相对热石中吸附自由能量的影响.
- 为了捕捉微孔介质中的特定位点相互作用和溶剂分子配置.
- 克服现有的溶解模型在多孔材料中的反应的局限性.
主要方法:
- 混合量子力学/分子力学自由能量扰动 (QM/MM-FEP) 技术.
- 定期静电嵌入式集群模型 (PEECM) 用于QM/MM计算.
- 大法典蒙特卡洛 (GCMC) 模拟用于水相采样.
主要成果:
- 计算了H-MFI热中甲醇和乙醇的气相吸附自由能量.
- 发现水环境会在布伦斯特德酸位点破坏甲醇和乙醇吸附的稳定性.
- 对甲醇和乙醇计算的无溶解吸附能量 (ΔΔGsolv) 分别为+0.44和+0.54 eV.
结论:
- 通过eSZS方法,可以准确地考虑热带石吸附中的溶剂效应.
- 水与吸附剂 (甲醇,乙醇) 竞争H-MFI焦化物中的空间,导致末性溶解效应.
- 通过修改孔径大小和疏水性,可以调整化物中的溶剂效应.
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