A Combined Chemical-Electrochemical Process to Capture CO2 and Produce Hydrogen and Electricity
A Combined Chemical-Electrochemical Process to Capture CO2 and Produce Hydrogen and Electricity
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DOI：
10.3390/en14185807
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发表时间：
2021-09
期刊：
影响因子：
3.2
通讯作者：
N. Shamim;S. Binzaid;J. Gabitto;J. Attia
中科院分区：
文献类型：
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作者：
N. Shamim;S. Binzaid;J. Gabitto;J. Attia
已经提出了几种碳封存技术来利用二氧化碳(CO2)来生产能源和化合物。然而，由于效率转化率低，对能源的要求高，可行的技术还没有被采用。流程强化通过将化学反应和分离操作相结合来提高流程生产率和效率。在这项工作中，我们提出了一个化学-电化学循环过程的模型，该过程可以捕获二氧化碳作为碳酸氢盐。拟议中的工艺还能产生氢气和电能。碳捕获是通过阴极上的反应来加强的，该反应将平衡转移到重碳酸盐生产中。文献资料表明，循环过程可以通过使用合适的离子膜来调节两个半电池之间的离子流动来保持离子平衡，从而实现长时间的稳定运行。数值模拟验证了概念的正确性。建议的工艺可以作为一种新的二氧化碳封存技术，同时产生电能和氢气。
Several carbon sequestration technologies have been proposed to utilize carbon dioxide (CO2) to produce energy and chemical compounds. However, feasible technologies have not been adopted due to the low efficiency conversion rate and high-energy requirements. Process intensification increases the process productivity and efficiency by combining chemical reactions and separation operations. In this work, we present a model of a chemical-electrochemical cyclical process that can capture carbon dioxide as a bicarbonate salt. The proposed process also produces hydrogen and electrical energy. Carbon capture is enhanced by the reaction at the cathode that displaces the equilibrium into bicarbonate production. Literature data show that the cyclic process can produce stable operation for long times by preserving ionic balance using a suitable ionic membrane that regulates ionic flows between the two half-cells. Numerical simulations have validated the proof of concept. The proposed process could serve as a novel CO2 sequestration technology while producing electrical energy and hydrogen.