First-Principles Studies of Carbon Dioxide Adsorption in Cryptomelane/Hollandite-Type Manganese Dioxide
A critical challenge in developing engineered materials for low-energy-cost carbon capture and storage applications is to fundamentally understand adsorption, particularly when the materials exhibit hysteretic sorption behavior. We used first-principles calculations and combined with experiments to explore CO2 sorption in a nanoporous solid: cryptomelane-type manganese dioxide (OMS-2). Cations present in this material to not only stabilize its porous structure but also tailor CO2-pore interaction. The concentration, type and charge of cations have significant effects on CO2 adsorption, diffusion and hysteresis behavior. OMS-2 with lower-charge cation, e.g. K+ (Cryptomelane), exhibits less hysteresis than OMS-2 with higher-charge cation, e.g. Ba2+ (Hollandite).
Li, Lan; Cockayne, Eric; Williamson, Izaak; Espinal, Laura; and Wong-Ng, Winnie. (2013). "First-Principles Studies of Carbon Dioxide Adsorption in Cryptomelane/Hollandite-Type Manganese Dioxide". Chemical Physics Letters, 580120-125. http://dx.doi.org/10.1016/j.cplett.2013.07.003