Abstract: Densified metal-organic frameworks (MOFs) and methods for manufacturing densified MOFs tailored to enhance gas separation processes. The methods employ an innovative densification method utilizing several techniques, including particle downsizing, systematic compression, and/or defect engineering, to minimize distances between particles. These processes effectively regulate the crystal structure, interparticle interactions, pore characteristics, and gas diffusion within the framework. The densified MOFs address challenges in gas separation technologies, offering scalable, energy-efficient solutions for applications such as CO2/hydrocarbon separation to Kr/Xe separation.