3. Adsorbents for CO₂ Capture

Solid adsorbents are promising for applications in post-combustion CO₂ capture scenarios. Some adsorbents include zeolites, activated carbon, carbon nanotubes, zeolites, and silicon-based adsorbents. The materials are characterized by their surface functional groups, porosity, surface area, pore size, metal ligands, and electrostatic interactions to determine their potential as adsorbents for CO₂. Organic adsorbents are promising for low temperature CO₂ adsorption because of their surface properties, such as high surface area, which enables it to be modified by adding additional metals and functional groups. Carbonaceous materials can be physically or chemically activated in order to enhance capture. Biochar, a material known for its benefits to agriculture, can also be used to capture CO₂. Modified Organic Frameworks (MOFs) combine metal ions and organic ligands to produce a crystalline porous network that is capable of selectively binding molecules at high capacity. Other solid adsorbents include zeolites, clays, silica-based adsorbents, and metal oxide-based adsorbents.