如何水促进了显著的5倍增长在低压二氧化碳吸收在中孔MIL-100(Fe) 中
Estelle Soubeyrand-Lenoir1, Christelle Vagner, Ji Woong Yoon
1MADIREL (UMR CNRS 7246), Aix-Marseille University and CNRS, Centre de St Jerome, 13013 Marseille, France.
Journal of the American Chemical Society
|May 18, 2012
概括
金属有机框架 (MOFs) 显示了随着湿度而变化的二氧化碳吸收. MIL-100(Fe) 显著增加了二氧化碳吸附的5倍,这表明在潮湿条件下可溶性提高.
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.
- 环境科学 环境科学
背景情况:
- 像金属有机框架 (MOF) 这样的多孔材料对于气体吸附至关重要.
- 了解湿度对二氧化碳捕获的影响对于开发高效的碳捕获技术至关重要.
- MOF的稳定性和性能可以受到水蒸气存在的显著影响.
研究的目的:
- 调查预平衡水蒸气对二氧化碳 (CO2) 吸收和吸附度在三个不同的MOF:HKUST-1,UIO-66和MIL-100的作用.
- 为了评估这些MOF在变化的相对湿度 (RH) 条件下在恒定的CO2压力 (0.2 bar) 下的性能.
- 阐明二氧化碳吸附变化背后的机制,以应对湿度的变化,特别是在MIL-100(Fe).
主要方法:
- 用重力测量分析测量了MOF样本在0.2bar时的CO2吸收,MOF样本在不同RH水平 (3%,10%,20%,40%) 处预平衡.
- 吸附热量与二氧化碳吸收平行测量.
- 进行循环测量以评估MIL-100中CO2吸附的可逆性.
主要成果:
- 在所有测试的RH水平中,UiO-66 (Zr) 呈现出一致的CO2吸收.
- 由于水蒸气的不稳定性,HKUST-1在相关性方面出现了困难.
- MIL-100(Fe) 显着增加了二氧化碳吸收的5倍,随着RH的增加,在40%的RH下达到105 mg g(-1),伴随着吸附度的显著降低.
- 循环研究证实了在初始微小变化后,MIL-100中CO2吸附的可逆性.
结论:
- 湿度在某些MOF中显著影响CO2吸附,MIL-100(Fe) 显示了增强的性能.
- 在MIL-100(Fe) 中观察到的二氧化碳吸收增加归因于充满水的中等孔中二氧化碳溶解度的提高.
- 由于其可逆性和增强湿度的吸附性质,MIL-100 (Fe) 是在潮湿条件下的二氧化碳捕获应用的有希望的候选者.
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