Abstract
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.
Highlights
The Fifth Assessment Report (AR5) of the United Nations Intergovernmental Panel on Climate Change (IPCC), predicts that the global surface temperature by the end of the 21st century could increase by more than 1.5 ◦ C relatively to the average temperature for the 1850–1900 period in most scenarios considered [1]
To compare simulation results using the electrochemical cell and CO2 absorption in a chemical reactor without redox reaction and transport through an IME we simulated the transient behavior of a batch chemical reactor with the same dimensions of the cathode half-cell
A theoretical model to study a combination of an electrochemical cell and chemical reaction for CO2 absorption has been proposed
Summary
The Fifth Assessment Report (AR5) of the United Nations Intergovernmental Panel on Climate Change (IPCC), predicts that the global surface temperature by the end of the 21st century could increase by more than 1.5 ◦ C relatively to the average temperature for the 1850–1900 period in most scenarios considered [1]. The decrease of the mean global temperature below the initially predicted 1.5 ◦ C requires global CO2 emissions to be curtailed by 45% by 2030, and achievement of net zero emission by 2050 [1]
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