Design and Optimization of CO2 sorbents for Point Source Emissions and Direct Air Capture

Sammanfattning: This thesis presents a comprehensive study on the design and optimization of CO2 sorbents, targeting two distinct applications: CO2 capture from point source emissions and Direct Air Capture (DAC). The research first introduces Na2HfO3 as a potential CO2 sorbent for point source emissions, using the molten salt effects of Na2CO3 and the thermal stability of HfO2. This combination results in a CO2 sorbent with impressive thermal and cyclic stability, through various optimization steps to enhance CO2 capture performance and efficiency. The study then shows into the structural disorder in Na2ZrO3, a chemically similar CO2 sorbent. This investigation fills a knowledge gap, offering new insights into the sorbent's behavior in CO2 capture. For DAC applications, the thesis explores the design of inorganic anion pillared metal-organic frameworks, focusing on the adjustment of M5+−F− bond lengths in inorganic anion pillars within M5+OFFIVE-1-Ni samples. These structural modifications impact the CO2 capture properties, particularly in terms of capacity and kinetics, demonstrating the potential of structural tuning in enhancing sorbent effectiveness. The synthesized samples exhibit good cyclic and water stability, suggesting their potential for practical DAC applications.