在选择性CO2吸附过程中触发门打开和呼吸效应
Veselina M Georgieva1, Elliott L Bruce1, Maarten C Verbraeken2
1EaStCHEM School of Chemistry , University of St Andrews , Purdie Building , North Haugh, St Andrews KY16 9ST , United Kingdom.
Journal of the American Chemical Society
|August 3, 2019
概括
灵活的化石 (MER) 显示了依赖于离子的二氧化碳吸附. MER由于触发孔隙开放,表现出优异的二氧化碳吸收和二氧化碳2/CH4分离,突出显示了量身定制的热性能.
科学领域:
- 材料科学
- 化学学
- 化学工程
背景情况:
- 具有灵活框架的热石具有可调节的气体吸附特性.
- 默里诺酸 (MER) 拓为选择性气体分离提供了潜力.
研究的目的:
- 研究Na,K和Cs交换的化石的结构反应和二氧化碳吸附行为.
- 评估这些MER变种在CO2/CH4分离中的性能.
主要方法:
- 用Si/Al=3.8合成Na,K和Cs-MER
- 使用X射线衍射 (PXRD) 的脱水诱导结构分析.
- 气体吸附测量 (单元异热,混合气体突破实验).
主要成果:
- 在所有离子形式的脱水后显著减少单元细胞体积.
- 观察到不同的结构对称性 (Na-MER的Immm,K-和Cs-MER的P42/nmc).
- K-MER 显示出更高的二氧化碳吸收率 (3.5 mmol g-1 在 1 bar, 298 K) 和 CO2/CH4 分离效率.
- Na- 和 Cs- MER 显示了动力学上有限的 CO2 吸附和偏好的 CH4 输送.
- 观察到由二氧化碳吸收引发的从狭窄到宽孔的"呼吸"过渡.
结论:
- 阴离体大小对化石的结构灵活性和气体吸附行为产生重要影响.
- 由于其快速触发的孔隙开放机制,K-MER对有效的二氧化碳捕获和二氧化碳2/CH4分离具有前景.
- 在MER热质中定制阴离子组成是优化分子选应用的可行策略.
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