在空气中选择性吸收剂:反向脂质双层结构在不含水的情况下形成中性碳酸
Fuyuhiko Inagaki1, Chiaki Matsumoto1, Takashi Iwata1
1Division of Pharmaceutical Sciences, Graduate School of Medical Sciences, Kanazawa University , Kakuma-machi, Kanazawa 920-1192, Japan.
Journal of the American Chemical Society
|March 18, 2017
概括
研究人员开发了新的疏水性胺二氧化碳吸收剂, 这一在二氧化碳捕获和储存 (CCS) 和直接捕获空气 (DAC) 方面的突破使二氧化碳的分离和净化变得更加简单.
科学领域:
- 化学工程
- 环境科学
- 材料科学
背景情况:
- 烟气和空气含有二氧化碳和水分,使选择性二氧化碳吸收复杂化.
- 需要外部能量去除吸收的二氧化碳中的水 (湿CO2),这对碳捕获和储存 (CCS) 和直接捕获空气 (DAC) 构成挑战.
研究的目的:
- 开发比水更好的二氧化碳吸收剂.
- 研究疏水组在提高二氧化碳吸收效率和简化除水方面的潜力.
主要方法:
- 在二氧化碳吸收剂中引入疏水性基.
- 在空气中测试二氧化碳吸收的正体,甲基和基二胺 (OXDA,MXDA,PXDA).
- 分析MXDA·CO2添加物的结构和特性,包括其在水中的行为.
- 热再生MXDA·CO2以获得干燥的二氧化碳和碳酸.
主要成果:
- 胺中的疏水性基组显著提高了对水的二氧化碳吸收选择性.
- 通过OXDA,MXDA和PXDA,可以从空气中吸收无水化CO2.
- 即使在水溶液中,MXDA·CO2也形成无水碳酸,归因于疏水性基和反向的脂质双层结构.
- 加热MXDA·CO2通过103-120°C的格里纳德反应产生干燥的二氧化碳和碳酸.
结论:
- 基于基胺的新型二氧化碳吸收剂提供了一个有前途的解决方案,用于在不含水的情况下选择性捕获二氧化碳.
- 开发的材料简化了干燥CO2的过程,降低了CCS和DAC应用的能源需求.
- 独特的无水碳酸形成和随后的格里纳德反应为二氧化碳利用和化学合成开辟了新的途径.
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