在金属有机框架中优化HostGuest交互网站,以进行基准的一步乙烯净化
Yan-Fei Li1, Jiao Lei2, Zhang-Lei Zhong1
1Key Laboratory of Applied Surface and Colloid Chemistry, Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Ministry of Education, Shaanxi Normal University, Xi'an, Shaanxi, China.
本研究引入了一种新的金属有机框架 (MOF) 策略,用于有效地从乙烯/乙烯/乙混合物中净化乙烯. 新的MOF表现出卓越的吸附能力,在单个步骤中实现高纯度乙烯.
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:
- 从三元乙烯/乙烯/乙混合物中净化乙烯是具有挑战性的,因为乙烯的中间体物理化学性质.
- 现有的方法难以在单个步骤中选择性吸附乙和乙到乙烯上.
研究的目的:
- 为金属有机框架 (MOFs) 制定一个协同的主机-客机交互策略,以实现乙烯的一步净化.
- 设计强大的MOF,能够优先吸附乙和乙,同时与乙烯结合较弱.
主要方法:
- 使用协同主机-客户互动策略,涉及乙的开放金属位点 (OMS) 和乙的芳香环 (AR).
- 合成了三种构造性异构的8连接[Fe3(μ3-O) ((COO) 6的三角 prismatic 三核集群基MOFs (SNNU-705-α/β/γ) 与氨基基团.
- 采用突破性实验,现场FT-IR光谱和DFT计算来验证吸附策略和性能.
主要成果:
- SNNU-705-α/β/γ MOFs对乙和乙的亲和力增强,对乙的结合力最弱.
- 在报告的MOF中,SNNU-705-γ在298K和1大气中实现了最高的乙吸收 (6.13 mmol g-1),用于298K和1大气中的单步乙烯净化.
- 突破性实验给出了SNNU-705-α/β/γ的7.07,6.75和5.46 mmol g-1的异常乙烯生产率 (>99.9999%纯度),超过了现有的吸附剂.
结论:
- 拟议的协同主机-客户互动策略有效地使复杂混合物中的乙烯能够在一阶段内净化.
- SNNU-705 MOF 具有显著的吸附性能和高选择性,表明工业应用的巨大潜力.
- 这项工作为开发用于工业气体分离工艺的先进吸附剂提供了一个有希望的新途径.
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