• High-performance CO2 direct air capture (DAC)
Benefits and Advantages
• Cost effective and readily scalable
• Easy to fabricate into various shapes with virtually any sorbent type
• Short preparation time (10 minutes for two layers of adhesive film)
• Regenerable and maintains performance after hot steam treatment
Researchers at Arizona State University have developed a novel adhesive film (≤ 250 μm thickness) that can be covered with sorbent beads or particles to efficiently uptake CO2 gas from passive ambient airflow. These lightweight adhesive films can accommodate a diverse range of sorbent sizes and types, from powders to large particles. With this sorbent support structure, ample surface area is provided for effective absorption of CO2 gas with minimal sorbent loss, even after steam regeneration. This sorbent-coated film can be stacked in multiple layers, which permits tuning of the total sorbent mass of the system.
Many sorbent materials used for CO2 uptake are in the form of fine powders, beads, or pellets. These materials have physical properties that do not allow for shaping into linear or sheet-like structures, which would provide more effective CO2 uptake from the air. Additionally, though some of these materials have excellent sorbent characteristics, structural support is required to facilitate airflow exposure without becoming entrained in the gas stream or dropped from the contactor during operation.