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A Combined Chemical-Electrochemical Process to Capture CO2 and Produce Hydrogen and Electricity


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.

Funding source: Support for this research provided by the Texas A&M System Chancellor’s Initiative, Prairie View A&M University (SMART MICROGRID) is kindly acknowledged. Partial support (Nabila Shamim and Jorge Gabitto) by two RISE Grants from the office of the Vice-President of Research at PVAMU is also acknowledged. This study was conducted at Prairie View A&M University.
Related subjects: Production & Supply Chain
Countries: United States

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