Enhanced CO2 capture and reverse water gas shift reaction using CaO in NaCl-CaCl2 molten salt medium

This study introduces an Integrated Carbon Capture and Utilisation-Reverse Water Gas Shift (ICCU-RWGS) approach, a novel method for in situ CO₂ adsorption and conversion, leveraging the synergistic effects of CaO within a NaCl-CaCl₂ molten salt blend to enhance CO₂ capture and conversion efficiency. Building upon this foundation, we optimize CaO concentration and operating temperature to maximize CO₂ uptake and conversion performance. The research focuses on integrating CaO with a NaCl-CaCl₂ molten salt blend (mass ratio 4:6) to improve CO₂ sorption and conversion performance. Findings show significant enhancements in CO₂ uptake and CO yield with the presence of molten salt compared to systems without it. The optimal operating temperature and CaO concentration are identified for maximum CO yield. Characterisation techniques like in-situ infrared spectroscopy, XRD, and SEM provide insights into the behavior of CaO in the molten salt, revealing the solubility of the partial carbonate formed from CO₂ and CaO, dispersion of CaO particles, and their morphological characteristics. Overall, the study demonstrates the potential of CaO-molten salt integration in improving ICCU-RWGS process efficiency and contributes to the development of more effective and sustainable ICCU technologies.