Journal
MICROPOROUS AND MESOPOROUS MATERIALS
Volume 163, Issue -, Pages 169-177Publisher
ELSEVIER
DOI: 10.1016/j.micromeso.2012.07.008
Keywords
Metal-organic framework; Membrane permeation; CO2 capture; Diffusion; Ni-MOF-74
Categories
Funding
- Basic Science Research Program [2011-0027369]
- National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology, Republic of Korea [2011-0022968]
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Continuous and defect-free Ni-MOF-74 membranes were prepared on alpha-alumina support via a layer-by-layer seeding technique followed by secondary growth crystallization. The seeded supports were examined by SEM-EDX and AFM which evidenced that a uniform and compacted seeding layer can be formed on porous substrate surface through four alternated immersion cycles. Then Ni-MOF-74 seeding layer can grow into continuous Ni-MOF-74 membranes under optimal synthesis solution conditions. The as-synthesized Ni-MOF-74 membranes were characterized by XRD, SEM, BET and TGA. The continuous and crack-free membranes can be synthesized based on comparatively more concentrated solution and yet excessively concentrated solution is disadvantageous to obtain the uniform and defect-free membranes. Gas permeation properties of the membranes were investigated for small gases such as H-2, N-2, CH4 and CO2. Compared with other gases, Ni-MOF-74 membrane exhibits the stronger adsorption affinity to CO2 and thus the permeation of CO2 through Ni-MOF-74 membrane is dominated by surface diffusion. The high H-2/CO2 ideal selectivity can be obtained for Ni-MOF-74 membranes. (C) 2011 Elsevier Inc. All rights reserved.
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