Assessment of the Effect of Process Conditions and Material Characteristics of Alkali Metal Salt Promoted MgO-Based Sorbents on Their CO₂ Capture Performance

CO2 capture using alkali metal salt (AMS)-promoted MgO-based sorbents at intermediate temperatures (300–500 °C) has gained increased interest recently. The prospects of such materials for were assessed in this work. We investigated the most reactive that have been reported literature (i.e., MgO promoted with a combination various AMS (including NaNO3, LiNO3, K2CO3, and Na2CO3)), examined how particle size (from powder to pelletized 500 ?m particles) reaction conditions (calcination/carbonation temperature partial pressure CO2) affect cyclic uptake thermogravimetric analyzer (TGA) ambient pressure. TGA results showed performance decreased significantly after pelletization, losing 74% its initial capacity. However, capacity continued increase over 100 cycles reached value (?0.46 gCO2/gsorbent) close powdery sample (?0.53 gCO2/gsorbent). Analysis via X-ray diffraction (XRD), inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscope (SEM), N2 physisorption, situ XRD suggests was related change nature species within molten phase is reflected by their recrystallization behavior when cooling them down room temperature, appeared be affected present during carbonation. Finally, best-performing evaluated packed bed reactor, order assess whether are capable removing significant amount from gas stream experiments very experiments; however, efficiency less than 10%, which currently appears too low an industrial postcombustion process viable. New material developments should not only focus on improving rate formation MgCO3 but also removal actually feasible.