电化学CO2分离的双盐阴离子摆动工艺
Fang-Yu Kuo1, Sung Eun Jerng2, Betar M Gallant2
1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
ACS central science
|October 2, 2023
概括
这项研究引入了一种电化学的阴离子摆动过程,用于使用氨酸吸附剂分离二氧化碳 (CO2). 这种方法为传统的热方法提供了低能耗的替代方案,将可再生能源整合到有效的二氧化碳捕获中.
科学领域:
- 电化学 电化学 电化学
- 化学工程是化学工程的重要组成部分.
- 材料科学 材料科学 材料科学
背景情况:
- 传统的二氧化碳分离方法依赖于热能,限制了与可再生能源的整合.
- 电化学CO2分离提供异热,环境操作和可再生能源的兼容性.
- 对于不同的排放源,需要新的电化学二氧化碳分离技术.
研究的目的:
- 开发和研究一种用于可逆二氧化碳捕获的新型电化学阴离子摇摆工艺.
- 探索使用阴离子同一性对液体氨基吸附剂二氧化碳负荷的调制.
- 评估这种新型电化学分离方法的能源效率和性能.
主要方法:
- 利用一种可逆的碳酸酸转化反应,由不同的易斯酸 (K +,Li +,Ca2 +,Mg2 +,Zn2 +) 诱导.
- 采用核磁共振 (NMR) 光谱仪进行物种化研究和气流反应微热度测量以探测反应能量.
- 建造并测试了一种原型电化学电池,采用普鲁士白色阴极,阳极和乙氧乙胺/二甲基硫氧化物电解质.
主要成果:
- 在二甲基硫氧化物 (DMSO) 中通过离子交换对乙氧乙烯胺 (EEA) 进行可逆的 CO2 负荷调制.
- 确定了阴离子和氨基-CO2 adduct 之间的能量驱动力,影响了重新规范.
- 在实际CO2负载三角值为~0.15mol CO2/mol amine的情况下,实现了~22-39 kJ/mol CO2的低CO2分离能量.
结论:
- 电化学的阴离子转变过程是二氧化碳分离的可行替代方案,提供低能耗.
- 阴离子标识在可逆的氨基-CO2 adduct re-speciation 中起着至关重要的作用.
- 进一步优化电解质和电池设计可以提高连续二氧化碳捕获的性能.
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