Work

The study of natural dolomite as a prospective material for CO2 capture employing a novel approach to the evaluation of breakthrough curves

Year: 2025

Type: article

Abstract: • The calcination temperature of natural dolomite was successfully optimized. • Breakthrough curves were successfully fitted by the modified Avrami equation. • Trends of rate constant, Avrami coefficient, and retention time were proposed. • Adsorption capacity increased up to 2 nd / 3 rd regeneration and then decreased. The capture of carbon dioxide (CO 2 ) is a critical technology for addressing climate change and sustainability objectives. In this study, the performance of natural dolomite as an effective sorbent for repeated CO 2 capture was evaluated. The results suggested that an optimal calcination temperature of 850 °C was beneficial for minimizing surface sintering of the dolomite, thereby facilitating effective decarbonation. Breakthrough curve analysis was conducted to evaluate the dynamic adsorption performance of dolomite at varying CO 2 concentrations (10 %, 12 %, and 16 %). To assess the progress of gas adsorption onto regenerated dolomite, an innovative method of curve fitting using the modified Avrami equation was employed, which provided three essential parameters for the adsorption process: retention time, rate constant, and Avrami coefficient. A steady decrease in breakthrough time and adsorption efficiency was found to be correlated with sintering and surface area loss. The maximum CO 2 adsorption capacity was achieved during the second or third cycle for all three measured CO 2 concentrations; however, performance gradually deteriorated in subsequent cycles due to surface sintering and a reduction in specific surface area. TPD and BET analyses supported the conclusion that the surface area decreased with repeated regeneration, and the basic active sites were reduced.

Source: Open Ceramics

DOI: 10.1016/j.oceram.2025.100844