Adsorption equilibria of CO2, CH4, N2, O2, and Ar were determined on three lab-synthesized ZSM-5 adsorbents and four commercially available high silica zeolites including HiSiv-3000, HSZ-980HOA, HSZ-890HOA, and HSZ-390HUA. The synthesized ZSM-5 samples have a similar pore textural property (Brunauer-Emmett-Teller (BET) surface area and pore volume) as that of HiSiv-3000. The BET surface areas and total pore volume of the ZSM-5 sample were found to be ∼300 m2·g -1 and 0.2 cm3·g-1, respectively. The synthesized materials have relatively higher adsorption capacities than those of HiSiv-3000 for the gases studied in this work. The order of adsorption capacities of CO2, CH4, N2, Ar, and O 2 on each high silica zeolite follows the order of their polarizabilities. The selectivities of N2/O2 and Ar/O 2 pairs are close to 1.0, suggesting that it is very difficult to separate them by equilibrium-based adsorption processes. HSZ-890HOA and synthesized DT-100 showed higher equilibrium selectivities for CO2 over N2 and CH4, implying that they are potential adsorbents for CO2 separation from flue gases as well as landfill gases.
ASJC Scopus subject areas
- Chemical Engineering(all)