对二氧化硫的胺附加的稳定性评价
Surya T Parker1,2, Alex Smith3, Alexander C Forse1
1Department of Chemical and Biomolecular Engineering, University of California Berkeley, Berkeley, California 94720, United States.
Journal of the American Chemical Society
|October 20, 2022
概括
尽管暴露于SO2,但胺附着的金属有机框架显示出出色的CO2捕获稳定性. 主要的二胺变种抵御二氧化硫的降解,使工业废气中强大的碳捕获成为可能.
科学领域:
- 材料科学
- 化学工程
- 环境科学
背景情况:
- 金属有机框架 (MOF) 像胺附加的Mg2 (dobpdc) 在二氧化碳捕获方面具有前景.
- 这些MOF对二氧化硫 (SO2) 的稳定性至关重要,但在很大程度上未经测试.
- 了解二氧化对碳捕获技术的实际应用至关重要.
研究的目的:
- 研究SO2对dmpn-Mg2的稳定性和二氧化碳吸附性能的影响.
- 在SO2暴露下评估不同胺附加Mg2的强度.
- 阐明在存在SO2时控制MOF稳定性的结构性质关系.
主要方法:
- 进行了SO2突破实验和CO2同位素测量.
- 评估了各种胺附着的Mg2 () MOF的稳定性.
- 使用固态15NNMR光谱和密度函数理论 (DFT) 的计算.
主要成果:
- 在暴露于含有SO2的湿模拟烟气后,dmpn-Mg2 ((dobpdc) 保持了91%的CO2容量.
- 与1°,2°和1°,3°变种相比,使用初级,初级 (1°,1°) 胺的MOF表现出较高的稳定性.
- SO2降解机制涉及在不稳定的MOF中与金属结合的氨基发生反应,而稳定的MOF则在不破坏金属-胺结合的情况下形成二硫酸.
结论:
- 在现实的碳捕获条件下,胺附着的Mg2{\dobpdc}MOF,特别是含有1°,1°胺的MOF,对SO2具有显著的稳定性.
- 已确定的结构-属性关系为设计工业烟气处理的更稳定的MOF提供了途径.
- 这些发现支持dmpn-Mg2 ((dobpdc) 作为煤烟气碳捕获的耐用吸附剂的潜力.
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