(339g) CO and CO2 Adsorption by a New ZSM-5@MOF-199 Composite Adsorbent

Detrimental effects of greenhouse and hazardous gases such as climate change and ozone depletion can be mitigated by CO and CO2 capture from point sources or ambient air. Adsorption gained extensive attention due to its low energy requirement. Here, we report the development of ZSM-5@MOF-199 composite comprised of a copper-based metal organic framework (MOF) shell and ZSM-5 zeolite core through the solvothermal method. Using techniques such as XRD, surface and pore analysis, and SEM, we confirmed the formation of the composite. We demonstrated that the anion of the copper source affects the physical structure of the formed MOF shell. Single component adsorption isotherms of CO, CO2, and N2 were collected at 25 °C to investigate the equilibrium adsorption capacity and selectivity. We systematically controlled the Cu+/Cu2+ ratio through auto-reduction under vacuum to enhance the composite's CO adsorption capacity and selectivity. The increase in the Cu+/Cu2+ ratio was confirmed using XPS analysis. Moreover, the kinetics of adsorption were investigated under realistic conditions. We investigated the adsorbate-adsorbent interaction using various equilibrium and kinetic models to show the potential of ZSM-5@MOF-199 composite for CO and CO2 capture from source point processes.