Selective Electrochemical Regeneration of Aqueous Amine Solutions to Capture CO<sub>2</sub> and to Convert H<sub>2</sub>S into Hydrogen and Solid Sulfur
Removing CO<sub>2</sub> from natural gas or biogas in the presence of H<sub>2</sub>S is technically challenging and expensive as it often requires separation of both acid gases from the gas, typically using an aqueous amine solution, followed by separation of CO<sub>2&l...
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| Autores principales: | , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/1a23fa9ba7db48e49d10425c46078015 |
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| Sumario: | Removing CO<sub>2</sub> from natural gas or biogas in the presence of H<sub>2</sub>S is technically challenging and expensive as it often requires separation of both acid gases from the gas, typically using an aqueous amine solution, followed by separation of CO<sub>2</sub> from H<sub>2</sub>S and conversion of H<sub>2</sub>S into solid S. In this work, the proof of concept of electrochemical, instead of thermal, regeneration of an aqueous amine solution is developed. This invention might be a very promising technology and has several advantages. It has H<sub>2</sub>S versus CO<sub>2</sub> selectivity of 100%, can directly convert H<sub>2</sub>S into S and H<sub>2</sub>, and is economically competitive with CO<sub>2</sub> desorption energy around 100 kJmol<sup>−1</sup> and H<sub>2</sub>S conversion around 200 kJmol<sup>−1</sup>. If renewable energy is used for electrochemical regeneration, CO<sub>2</sub> emissions due to the CO<sub>2</sub> capture process can be significantly reduced. |
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