在铁三酸盐金属有机框架中通过吸附剂依赖的旋转状态进行可逆CO清理
Douglas A Reed, Dianne J Xiao, Miguel I Gonzalez
1Department of Chemistry, Missouri University of Science and Technology, University of Missouri , Rolla, Missouri 65409, United States.
Journal of the American Chemical Society
|April 21, 2016
概括
一种新的金属有机框架Fe-BTTri显示出高度选择性的一氧化碳 (CO) 吸附. 这种材料通过独特的旋转状态变化机制表现出可逆的CO结合,使得高效的气体分离和净化成为可能.
科学领域:
- 材料科学
- 化学学
- 化学工程
背景情况:
- 选择性气体吸附对于各种工业过程至关重要,包括气体净化和分离.
- 金属有机框架 (MOF) 为气体吸附应用提供可调节的孔隙性和功能.
- 对于一氧化碳等特定气体,开发具有高选择性和可逆性的材料仍然是一个挑战.
研究的目的:
- 合成和描述一个新的金属有机框架,Fe-BTTri.
- 研究Fe-BTTri对其他气体分子的选择性吸附特性.
- 在Fe-BTTri中阐明CO吸附和脱吸的机制.
主要方法:
- 合成Fe-BTTri金属有机框架
- 在低压下测量气体吸附等温.
- 使用红外光谱,单晶X射线分析,Mössbauer光谱和磁敏度测量进行了表征.
- 对CO协调时的旋转状态变化机制的研究.
主要成果:
- 即使在非常低的压力下,Fe-BTTri对CO吸附H2,N2和CH4具有很高的选择性 (100 μbar时为1.45 mmol/g).
- 该框架通过Fe (II) 中心的独特旋转状态变化机制来证明易于逆转的CO结合.
- 鉴定证实了吸附剂诱导的旋转状态过渡,对二氧化碳有选择性,这有助于材料再生.
结论:
- 由于其旋转状态变化机制,Fe-BTTri是一种高效的选择性CO吸附和分离材料.
- 在气体分离的多孔材料中观察到的可逆旋转转变是新的和有前途的.
- 这种机制具有涉及其他π酸气体的选择性分离的潜力.
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