(395bc) Adsorption Characteristics of CO2, N2, CH4 and CO in CB6 Powder and Pellet

The organic molecular porous material obtained by re-crystallization of cucurbit[6]uril (CB6) from HCl shows a high CO₂ sorption capacity at atmospheric condition. The adsorption characteristics, such as equilibrium and kinetics, of CO₂, N₂, CH₄ and CO molecules on a CB6 powder and CB6 pellet were investigated from 0 to 2 atm and from 283K to 343K using a gravimetric method. As adsorption mechanisms of CO₂, N₂, CH₄ and CO molecules on CB6, pore structures, molecular sizes/structures, adsorption affinities, steric hindrance, surface diffusion and equilibrium adsorption amount were considered. A magnetic suspension balance (MSB, Robotherm Co.) system was used for measuring transient adsorption amount and internal temperature. Various adsorption equilibrium models and kinetic models were introduced for comparing with experimental data. Diffusivity estimation tools and PDE (partial differential equation, 3D model) code for sorption kinetics were developed by using FORTRAN and MATLAB. Breakthrough tests of CO₂/N₂ mixtures were investigated in a CB6 pellet packed bed with varying CO₂ concentration, total flow rate, operating pressure and temperature.