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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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导向的金属引诱MOF膜用于分离.

Ju Bai1,2,3, Luqi Xiao1, Xiangping Zhang1,3,4

  • 1Beijing Key Laboratory of Solid State Battery and Energy Storage Process, State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China.

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面向金属有机框架 (MOF) 膜使用一种新的金属-战略来有效分离进行了合成. 这一突破使得高性能/甲分离和度成为可能,超越了现有的膜技术.

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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.
  • 纳米技术纳米技术

背景情况:

  • 面向金属有机框架 (MOF) 膜对于 (He) 分离至关重要,但合成具有挑战性.
  • 现有的MOF膜往往难以满足高选择性和透性要求,以有效地分离He/CH4.

研究的目的:

  • 开发一种用于合成面向MOF膜的新方法,用于先进的分离.
  • 为了实现高性能的He/CH4分离,超过了罗伯森的上限.
  • 为了证明开发的膜技术的稳定性和可扩展性.

主要方法:

  • 使用金属有机多面体 (MOP) 碎片作为金属-,制备一个定向的MOF膜.
  • 通过金属链,通过c轴诱导以{001}为导向的Zr-MOF生长.
  • 膜方向的特征,分离性能和在各种条件下的稳定性.

主要成果:

  • 实现了精确的He/CH4分离,具有77.3的选择性和695.1的He透度. GPU.
  • 证明了异常强大的膜强度,可以承受高压 (40巴),热冲击 (-25°C至85°C) 和长期运行 (1000小时).
  • 一个三阶段的膜工艺成功地将He从0.3%缩到99.9%.

结论:

  • 金属-定策略为制造各种定向MOF膜提供了一种通用方法.
  • 开发的MOF膜为分离提供了卓越的性能,超越了现有技术和罗伯森上限.
  • 这项工作突出了面向MOF膜在工业提取方面的巨大潜力.