Adsorption‐hydration hybrid process for CO2 capture in a fixed bed of activated carbons

This work reports an investigation of using a fixed bed of activated carbons (ACs) to capture CO2 at hydrate formation conditions. The experiments were conducted at 277.15 K and 3.5 MPa. The water saturation (WS) of the fixed bed of ACs varies from 0% to 100%. The results indicate that an adsorption‐hydration hybrid process occurred in the fixed bed of wet ACs while a single adsorption process occurred in the fixed bed of dry ACs. The adsorption‐hydration hybrid process performs better than the single adsorption process for CO2 capture. Gas consumption at 100% WS is 3.18 times greater than that obtained using dry ACs (single adsorption process). It is found that 40% WS is an optimal value, and the gas consumption obtained at this WS is larger than that obtained at 0%, 70%, and 100% WS. This gas consumption is also greater than that obtained using stirred reactors at the same temperature and pressure conditions, so the adsorption‐hydration hybrid process achieved in the fixed bed of wet ACs has a greater potential to capture CO2 in comparison with the single adsorption or hydrate formation process.