A COMBINED CHEMICAL-ELECTROCHEMICAL PROCESS TO CAPTURE CO2 AND PRODUCE HYDROGEN AND ELECTRICITY
C. Mansogo1, N. Shamim,1 S. Binzaid2, J. F. Gabitto,1* (Faculty Mentor), and J. Attia2 1 Department of Chemical Engineering, Prairie View A&M University Department of Electrical & Computer Engineering, Prairie View A&M University
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Several carbon sequestration technologies have been proposed to utilize carbon dioxide (CO 2) to produce energy and chemical compounds. However, feasible technologies have not been adopted due to the low-efficiency conversion rate and high-energy requirements. We present a chemical-electrochemical cyclical process that can capture carbon dioxide as a bicarbonate salt in this work. 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. The cyclic process can create stable operation for long times by preserving ionic balance using a suitable ionic membrane that regulates ionic flows between the two half-cells. One theoretical model has been derived from accounting for all the different reactive and transport processes. A dynamical equilibrium is established among all the various processes, and the final steady-state is a result of this dynamical situation. Several individual models are used to simulate transport through the membrane, solution sides, and into the electrical boundary layers (EDLs) in contact with the electrodes. An electrochemical reaction is considered inside the EDLs, and a chemical reaction in the solution contacted the cathode. Numerical simulations and experiments have validated the proof of the concept. The proposed process could serve as a novel CO2 sequestration technology while producing electrical energy and hydrogen.
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