(663c) Immobilizing Metal Organic Frameworks on Active Substrates for CO2 adsorption
Scaling up gas separation processes requires novel approaches for manufacturing of adsorbent materials into scalable contactors such as monolithic structures that offer a cost-effective platform for practical applications in comparison to traditional packing systems. In this study, several metal-organic frameworks (MOFs) are supported on a variety of commercial and synthesized monolithic substrates and their dynamic adsorption behavior are assessed in a rapid pressure swing adsorption (RPSA) system for post-combustion CO2 capture. To gain control over crystal nucleation and growth, various bottom-up growth techniques are employed and optimized with respect to uniformity, thickness, and adsorption characteristics of the MOFs films. To further improve the equilibrium capacity, post-functionalization of composite adsorbents are carried out using several aminopolymers and aminosilanes. In addition, long-term stability of the structured adsorbents are evaluated by performing cyclic operation. Furthermore, to assess the influence of water on adsorption behavior of coated monoliths, both dry and humid runs are performed under real conditions. Finally, the influence of SOx/NOx impurities are determined by exposing the structured adsorbents to a simulated flue gas containing SO2 and NO.