In adsorption CO2 capture, which utilizes interactions at the surface, porous solid adsorbents are used to attract CO2 into their pores having large surface areas. Adsorption methods have been performed and studied on large scale less than absorption methods but has attracted increased interest; they are compatible with pre-combustion, post-combustion, and direct air capture. The solid materials used are more stable, less toxic and easier to handle compared to liquid absorbents.