(571l) Novel Sorbent Particle for CO2 Capture and Utilization

This study reports two distinct families of sorbents for CO₂ capture and combined capture and utilization. In the first part of the study, we report perovskite oxides as a new family of tunable sorbents. Perovskite oxides offer excellent flexibility to tailor the sorption kinetics and thermodynamic parameters. Using Sr_xLa_1-xFeO₃ as a basis, we showed that changing the A-site cation composition is highly effective in adjusting the CO₂ adsorption and desorption characteristics, allowing tunable CO₂ capture and release. A strong correlation between the oxide surface area and sorption capacity was also established. Despite the low surface area inherent to perovskite oxides, we enhanced their surface area from <5 m²/g to ~30 m²/g using a electrospinning method. Sr_0.2La_0.8FeO₃ prepared via electrospinning exhibited a relatively moderate desorption temperature (~240°C) and a CO₂ sorption capacity of 0.68 wt.%. We also showed that the sorption material can be effectively utilized for CO₂ capture and methanation in a temperature range of 250 to 300°C.

In the second part of this study, we report hybrid organic-inorganic sorbent particles by functionalizing mesoporous SiO₂ spheres (MSS) with 3-Aminopropyl triethoxysilane (APTMS) to introduce amine functional groups. In this study, MSS-(x)NH₂ (where x= 0.1, 0.5, and 1) was synthesized for CO₂ adsorption, with x representing the volume of APTMS per gram of MSS. The adsorption capacity of these samples was assessed using TGA, revealing that MSS-(1)NH₂ exhibited the highest capacity, with a 2.5% CO₂ sorption capacity and excellent stability.