Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 22, Pages 11246-11254Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta02462b
Keywords
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Funding
- Korea CCS RD Center (KCRC) [2014M1A8A1049309]
- Basic Science Research Program through the National Research Foundation (NRF) of Korea [2015R1A1A1A05027663]
- Engineering Research Center through the National Research Foundation (NRF) of Korea [2016R1A5A1009592]
- Korean government (Ministry of Science, ICT & Future Planning
- MSIP)
- Korea University Future Research Grant
- R&D Convergence Program of MSIP
- NST (National Research Council of Science & Technology) of Korea [CRC-14-1-KRICT]
- UNIST-HPC
- KISTI-PLSI
- Ministry of Science & ICT (MSIT), Republic of Korea [2E27370] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Council of Science & Technology (NST), Republic of Korea [CRC-14-1-KRICT] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2014M1A8A1049309, 2016R1A5A1009592, 2015R1A1A1A05027663, 2017H1A2A1045514] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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An all-silica deca-dodecasil 3R (Si-DDR) zeolite with a pore size of 0.36 x 0.44 nm(2) is highly desirable for membrane-based separation of CO2 (0.33 nm) from N-2 (0.364 nm), which is critical in the post-combustion carbon capture process, via molecular recognition of their slight size difference. For the first time, we acquired h0h-oriented, hydrophobic DDR zeolite films through the epitaxial growth of a DDR seed layer with a structure directing agent of methyltropinium iodide. The degree of the out-of-plane orientation and inter-growth was increased with the secondary growth time, while reducing the defects that provide non-selective pathways. The resulting DDR membrane showed a CO2/N-2 separation factor (SF) as high as 11.9 at 50 degrees C (a representative flue-gas temperature) under dry conditions. More desirably, it could achieve a much enhanced CO2/N-2 SF of up to 15.9 at 50 degrees C in the presence of H2O vapor (3rd largest component in the flue-gas). The transport of the larger N-2 molecule, plausibly its entering the pore mouth of DDR zeolites, was more inhibited by H2O molecules adsorbed on the membrane surface; it appears that this surface resistance was due to the hydrophobicity of the highly siliceous DDR membrane and beneficial for improving CO2/N-2 SFs under wet conditions.
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