预测通过功能化的多孔芳香框架将酸性气体从气体混合物分离出来
Yuxiang Wang1, Chang Han1, Susan B Sinnott1,2,3,4
1Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.
Langmuir : the ACS journal of surfaces and colloids
|March 8, 2024
概括
具有两个功能组的多孔芳香基架 (PAF) 显示了从混合物中增强酸性气体如CO2,SO2和H2S的选择性吸附. 功能组类型和压力显著影响吸附能力和选择性.
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.
- 计算化学的计算化学
背景情况:
- 多孔芳香框架 (PAF) 是具有可调节结构的先进材料.
- 选择性吸附酸性气体对于环境应用和工业过程至关重要.
- 了解功能组对PAF吸附性质的影响至关重要.
研究的目的:
- 通过计算来研究从二元混合物中气中选择性吸附酸性气体 (CO2,SO2,H2S) 的PAF,其功能是具有两个相同组 (PAF-R2) 的PAF.
- 评估功能组类型和度对吸附能力和选择性的影响.
- 探索压力对PAF-R2材料吸附性能的影响.
主要方法:
- 大法典蒙特卡洛 (GCMC) 模拟被用来建模吸附过程.
- 在低分子度下模拟了酸气/ (CO2/N2,SO2/N2,H2S/N2) 的二元气体混合物.
- 对原始,单功能和双功能PAF的吸附行为进行了比较.
主要成果:
- 与原始和单一功能PAF相比,双重功能PAF (PAF-R2) 呈现出增强的酸气载荷和选择性.
- 气体负载与低压下的压力线性增加,而选择性保持不变.
- 在高压下,吸附和选择性都显著增加,SO2吸附对PAF的吸附极限特别敏感.
- 具有两个电子吸收组的PAF,如PAF-(3,5)-(COOH) 2,表现出色.
- 具有两个电子捐赠组的PAF,如PAF-3,5-OH) 2,表现出良好的吸附性和选择性,特别是在高压下.
结论:
- 在PAF中的功能组的存在和类型对它们选择性吸附酸性气体的能力产生了关键影响.
- 压力在增强吸附能力和选择性方面发挥着重要作用,特别是在某些酸性气体 (如SO2) 中.
- 这些发现为设计和选PAF和其他多孔材料提供了宝贵的见解,用于高效的酸气捕获应用.
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