在二胺附加-奥尔萨拉框架中合作捕获二氧化碳
Ziting Zhu1,2,3, Surya T Parker4,3, Alexander C Forse4,2
1Department of Materials Science and Engineering, University of California, Berkeley, California94720, United States.
Journal of the American Chemical Society
|July 26, 2023
概括
新的金属有机框架具有二Mg2 ((olz) 显示单步二氧化碳吸附,以有效捕获碳. 这些材料具有很高的稳定性和容量,优于现有的烟气处理吸附剂.
科学领域:
- 材料科学
- 化学工程
- 环境科学
背景情况:
- 有链的金属有机框架 (MOF) 对二氧化碳捕获具有前景.
- 现有的MOF如胺附加Mg2 ((dobpdc) 具有高的二氧化碳选择性,但遭受双步吸附,增加再生能量.
- 胺的大量替代剂增强稳定性和二氧化碳吸附性,但可能导致硬质排斥问题.
研究的目的:
- 开发具有单级二氧化碳吸附配置的新型MOF,以改善碳捕获.
- 研究氨基基度和固体质量对二氧化碳吸附性能的影响.
- 评估新的MOF在模拟煤烟气中捕获二氧化碳的性能.
主要方法:
- 用多种多重的二替代剂合成二-Mg2{olz}框架.
- 在各种压力和温度下进行二氧化碳吸附/脱附等温测量.
- 频谱表征 (例如,FTIR,NMR) 和范德瓦尔斯纠正密度函数理论 (vdW-DFT) 的计算.
- 通过吸附/脱附循环评估热和氧化稳定性
主要成果:
- 胺-Mg2 ((olz) 框架具有理想的单阶段二氧化碳吸附.
- 氨基基度和硬质量显著影响吸附阶段压力和合作性.
- 在e-2-Mg2 ((olz) 材料中,通过模拟的烟气捕获超过90%的二氧化碳.
- 在延长循环过程中观察到e-2-Mg2{olz}的异常热和氧化稳定性.
- 通过光谱和DFT证实了二氧化碳捕获机制的氨基碳酸盐链形成.
结论:
- 胺-Mg2 ((olz) 框架为单步吸附有效的二氧化碳捕获提供了一个有前途的平台.
- 对氨基替代物的明智设计 (基本性和硬质量) 对于优化MOF性能至关重要.
- 该e-2-Mg2 ((olz) 材料是燃烧后二氧化碳捕获的高性能吸附剂.
- 这些发现为工业碳捕获应用开发先进的MOF铺平了道路.
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