Harnessing reaction-Controlled regime of amine-Impregnated adsorbents via Tracking optimal adsorption Timing for enhancing CO₂ capture efficiency

This study develops innovative optimization and design strategies for amine-impregnated solid adsorbents to enhance CO₂ capture performance using composite materials. Tetraethylenepentamine (TEPA) is impregnated into a composite material composed of carbon nanotubes (CNTs) and silica nanoparticles as the support. The relationship between amine loading efficiency and the characteristics of the support materials is examined. The findings show that while a higher specific surface area benefits amine loading, pore width is also crucial for improving amine loading efficiency, which results in a higher CO₂ adsorption rate and capacity. Furthermore, a novel optimization methodology, the fraction of adsorption rate, is proposed to effectively harness fast reaction-controlled regimes. This method allows for the precise identification of the inflection point where the effectiveness of the adsorption rate begins to decline, along with a specific adsorption performance metric that evaluates the amount of CO₂ adsorbed relative to the desorption energy required. This approach allows for the accurate adjustment of operating duration to maximize CO₂ capture efficiency across various conditions. Overall, the findings contribute to advancing carbon capture technologies by providing insights into effective amine impregnation and introducing an innovative framework for optimizing the performance of adsorption-based environmental solutions.