ラミネート支持ポリ（エチレンイミン）直接空気回収吸着剤の性能に気候条件とアミン負荷量が与える影響

Direct air capture (DAC) of CO₂ is a critical technology to combat climate change, offering a scalable approach to mitigate atmospheric CO₂ accumulation. Despite advancements in adsorbent materials, the performance of DAC systems remains highly sensitive to environmental conditions, such as temperature and humidity. Poly-(ethylenimine) (PEI)-functionalized silica has emerged as a promising sorbent due to its high CO₂ capacity and tunable properties. However, optimizing its performance across diverse climatic conditions requires a deeper understanding of how the PEI loading impacts the adsorption capacity and kinetics under varying temperatures and humidities. This study reports the CO₂ and H₂O adsorption kinetics and capacities, desorption behavior, and speciation of adsorbed CO₂ using silica/PEI adsorbents supported within expanded poly-(tetrafluoroethylene) (ePTFE) sheets across a wide range of temperatures and humidities, representing the diversity of climates found across the United States. With the obtained data, guidelines for selecting and optimizing PEI-loaded silica-based sorbents for DAC applications are developed. These findings provide a framework for tailoring sorbents to specific climatic scenarios, ensuring a reliable and efficient DAC performance.