Decay on Cyclic CO2 Capture Performance of Calcium-Based Sorbents Derived from Wasted Precursors in Multicycles

In order to obtain the cheap waste calcium-based sorbent, three wasted CaCO3 precursors, namely carbide slag, chicken eggshells, and analytical reagent-grade calcium carbonate, were selected prepared at 700 °C form sorbents for CO2 capture. TGA was used test uptake performance of each sorbent in 20 cycles. To identify decay mechanism with an increasing number cycles, all characterized by using XRF, XRD, N2 adsorption. The specific surface area redefine formula cyclic carbonation reactivity decay. conversion rate exhibited a decreasing trend as cycle increased. Chicken eggshells most significant decrease (over 50% compared Cycle 1), while slag carbonate showed flat linear decline trend. samples calculate infinite rates estimated 0.2898, 0.1455, 0.3438 mol/mol, respectively, after 100