通过带有银离子的无孔柔性框架对小型不和碳化合物的高度选择性吸附
Sayaka Uchida1, Ryosuke Kawamoto, Hanae Tagami
1Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Journal of the American Chemical Society
|August 30, 2008
概括
这项研究引入了一种用于选择性碳化合物分离的新型柔性离子晶体. 它证明了从气体混合物中通过与银离子的pi复合物通过异常的乙烯和烯捕获.
科学领域:
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
- 分离科学 分离科学
背景情况:
- 柔性离子晶体为气体吸附提供独特的结构性质.
- 基于聚氧甲酸盐的材料正在探索选择性气体吸附.
- 含有银离子的材料显示了不和碳化合物捕获的潜力.
研究的目的:
- 为了合成和描述一种新的柔性离子晶体,Ag2[Cr3O(OOCC2H5)6(H2O) 3 2[alpha-SiW12O40].
- 为了研究这种材料对小不和碳化合物的吸附特性.
- 评估其在选择性乙烯采集中的应用.
主要方法:
- 单晶X射线晶体学 单晶X射线晶体
- 粉末X射线衍射 (XRD) 方法
- 在现场的红外光谱学.
- 吸附动力学研究研究吸附动力学.
主要成果:
- 晶体表现出小不和碳化合物 (乙烯,烯等) 的选择性吸附. 它们的含量超过1.0molmol{-1}.
- 乙烯/乙烯 (>100) 和/ (>100) 的高吸附比率在298K和100kPa时被观察到.
- 不和的碳化合物通过与Ag ((+)) 离子的pi复合,透到晶体体中.
- 该材料成功地用于从乙/乙烯混合物中收集乙烯.
结论:
- Ag2[Cr3O(OOCC2H5)6(H2O) 3) 2[alpha-SiW12O40] 显示出非凡的选择性吸附能力,用于不和碳化合物.
- 与银离子的pi复杂化机制是其高选择性的关键.
- 这种材料在气体分离的工业应用中显著有前途,特别是用于乙烯回收.
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