Georgia Tech Research Corporation has teamed with Inmondo Tech, Inc., to test a novel process that achieves 10 moles per kilogram sorbent swing capacity in a rapidly cycled pressure swing adsorption (RCPSA) process for post-combustion carbon dioxide (CO₂) capture from coal-fired power plants. Novel polymer/metal-organic framework (MOF) sorbent composite hollow fibers will be used in a new sub-ambient RCPSA process that integrates flue gas conditioning with a highly-compact pressure swing adsorption system. The research team will develop, fabricate, and test prototype MOF composite-fiber sorbent modules at sub-ambient conditions. The modules are comprised of polymeric fibers with embedded metal-organic framework particles. This approach benefits from two main innovations: (1) the sub-ambient flue gas is processed with energy and power recovery, enabling a low pressure drop fiber sorbent-based RCPSA system that is extremely compact and (2) a hollow fiber sorbent with a bore-side barrier layer has the potential to make the RCPSA fiber sorbent module even more compact. Additionally, the efficiency of the pressure swing cycle will be boosted by installing a stationary phase-change material in the bores of the hollow fiber sorbents that will isothermally melt upon release of sorption enthalpy and conversely isothermally freeze upon CO₂ desorption, requiring no steam or cooling water. The project is anticipated to result in a lab-scale evaluation of a prototype fiber sorbent module in a sub-ambient RCPSA with simulated flue gas and preliminary design, optimization, and economic analysis of a full scale system.