| Summary: | 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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