引入π复合在有孔的芳香框架中,以对乙烯的高度选择性吸附在乙上
Baiyan Li1, Yiming Zhang, Rajamani Krishna
1Department of Chemistry, University of South Florida , 4202 E. Fowler Avenue, Tampa, Florida 33620, United States.
Journal of the American Chemical Society
|June 6, 2014
概括
这项研究将π-复杂化引入多孔芳香框架 (PAF) 中,以增强乙烯捕获. 具有Ag (I) 功能化的PAF-1-SO3Ag具有优越的乙烯/乙选择性,使得高纯度乙烯的生产成为可能.
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.
- 吸附科学 吸附科学
背景情况:
- 多孔芳香框架 (PAF) 是具有高表面积的先进材料.
- 乙烯与乙的有效分离对于石化行业至关重要.
- 现有的材料往往缺乏这种分离所需的选择性和容量.
研究的目的:
- 在PAF中引入π复合,以改善乙烯吸附.
- 开发一种高度选择性的吸附剂,用于乙烯/乙分离.
- 为了证明开发的材料在乙烯净化中的实际应用.
主要方法:
- 用Ag(I) 离子对PAF-1的功能化产生PAF-1-SO3Ag.
- 使用单元异热和气体混合物的吸附实验.
- 理想吸附溶液理论 (IAST) 计算用于选择性预测.
- 在现场红外光谱检测以确认π复杂化.
- 暂时突破实验和压力摆动吸附 (PSA) 的过程模拟.
主要成果:
- PAF-1-SO3Ag 显示出异常高的乙烯/乙吸附选择性 (Sads: 27 到 125).
- 乙烯和Ag (I) 离子之间的π-复合被通过吸附和in situ红外光谱学证实.
- 这种材料显著超过了热利石和其他金属有机框架 (MOF) 的性能.
- 模拟显示使用PSA与PAF-1-SO3Ag.使用PSA生产99.95%+纯乙烯的可行性.
结论:
- 在PAF中引入π复合是一种可行的策略,可以增强乙烯的吸收.
- PAF-1-SO3Ag为选择性乙烯/乙分离提供了一个有前途的解决方案.
- 这项工作为设计用于气体分离的先进多孔材料开辟了新的途径.
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