(663a) CO2 Capture and Transport Behaviors of Porous Polymer Beads Containing Metal-Organic Frameworks (MOFs)

Authors: 
Rim, G., Columbia University
Bardiya, V., Ecole Polytechnique Fédérale de Lausanne (EPFL)
Stylianou, K., E?cole Polytechnique Fe?de?rale de Lausanne (EPFL)
Smit, B., École polytechnique fédérale de Lausanne
Park, A. H. A., Columbia University
A number of novel materials including metal-organic frameworks (MOFs) have been developed to capture CO2 from various industrial sources. While some recently synthesized MOFs have great CO2 capture capacity and even water tolerance, their delivery method is still debated. For example, MOFs can be used in the perm-selective layer of gas separation membranes. The direct use of MOFs is not desired due to the safety and process concerns related to fine powder handling. In this study, MOFs-bearing porous polymer beads are prepared and their CO2 adsorption behaviors are studied in a fixed bed and a fluidized bed reactor. CO2/N2 and CO2/CH4 gas mixtures are used as the inlet gas and the CO2 capture conditions are maintained at ambient condition (25 oC and 1 atm) while varying the gas velocity to obtain CO2 breakthrough curves. The experimental findings suggest that the CO2 adsorption kinetics of MOFs-bearing porous polymer beads are very fast and this delivery method of MOFs can allow for a flexible design of CO2 capture units ranging from a fixed bed to a fluidized bed. The effect of moisture on the CO2 adsorption behavior is also investigated while changing the chemical properties of the porous polymer substrate (e.g., hydrophilic vs. hydrophobic). The recyclability of the beads is determined via repetitive long-term CO2 adsorption and desorption experiments where the partial pressure of CO2 is controlled as well as humidity.