在低温下使用氨基/吸收剂直接捕获CO2的空气
Pranjali Priyadarshini1, Guanhe Rim1, Cornelia Rosu1
1School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, Georgia 30332-0100, United States.
ACS environmental Au
|September 25, 2023
概括
这项研究评估了在低温下直接捕获空气 (DAC) 的氨基基基吸附剂. 聚乙烯胺 (PEI) 和四乙烯胺 (TEPA) 在烯酸上显示出有希望的二氧化碳捕获,即使在湿度下,对于有效的DAC部署.
科学领域:
- 材料科学 材料科学 材料科学
- 环境工程 环境工程
- 化学工程是化学工程的重要组成部分.
背景情况:
- 随着二氧化碳 (CO2) 排放量的增加,气候变化正在加剧,需要直接捕获空气 (DAC) 技术.
- 胺基吸附剂是DAC的关键,但它们的性能通常在有限的温度和湿度条件下进行评估.
- 在现实世界中,DAC部署地点经常经历低于25°C的温度和不同的湿度水平.
研究的目的:
- 评估胺浸多孔在环境 (25°C) 和冷 (-20°C) 温度下的二氧化碳吸附性能.
- 研究湿度对这些吸附剂在不同温度条件下的二氧化碳捕获能力的影响.
- 确定有前途的吸收材料,用于可扩展的直接空气捕获应用,在各种环境中.
主要方法:
- 合成的多孔含有聚乙烯胺 (PEI) 和四乙烯胺 (TEPA),度不同 (20%和40%).
- 在25°C和-20°C的干燥和潮湿 (70%RH) 条件下,在400ppm CO2下评估的CO2吸附能力.
- 在10个吸附-脱吸周期中评估了表现最好的吸附剂的循环稳定性.
主要成果:
- 在干燥条件下,TEPA中含有40%重量的γ-Al2O3在25°C时显示出最高的CO2容量 (1.8 mmol/g).
- 在干燥条件下的-20°C下,40 wt%和20 wt%的TEPA吸附剂表现出强的性能 (分别为1.6和1.1 mmol/g).
- 引入湿度显著改善了PEI和TEPA吸附剂在两个测试温度下的CO2吸收.
结论:
- 用PEI和TEPA浸的γ-Al2O3是可以在环境和寒冷条件下直接捕获空气的可行材料.
- 吸附剂表现出良好的二氧化碳吸收和稳定的性能,湿度提高了它们的捕获效率.
- 这些发现支持优化这些材料在各种气候中进行大规模DAC部署的潜力.
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