Kim, Eunjoo Hong, Sungwon Jang, Eunhee Lee, Jeong Hyeon Kim, Jin Chul Choi, Nakwon Cho, Churl Hee Nam, Jaewook Kwak, Sang Kyu Yip, Alex C. K. Choi, Jungkyu 2024-01-20T01:04:33Z 2024-01-20T01:04:33Z 2021-09-05 2017-06-14 2050-7488 https://pubs.kist.re.kr/handle/201004/122627 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. English ROYAL SOC CHEMISTRY PERMEATION PROPERTIES MOLECULAR-SIEVE DIOXIDE CAPTURE MFI MEMBRANES POWER-PLANT CO2 CAPTURE GAS SEPARATION TRANSPORT GROWTH An oriented, siliceous deca-dodecasil 3R (DDR) zeolite film for effective carbon capture: insight into its hydrophobic effect Article 10.1039/c7ta02462b 1 JOURNAL OF MATERIALS CHEMISTRY A, v.5, no.22, pp.11246 - 11254 JOURNAL OF MATERIALS CHEMISTRY A 5 22 11246 11254 scie scopus 000402734600054 2-s2.0-85021724249 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article PERMEATION PROPERTIES MOLECULAR-SIEVE DIOXIDE CAPTURE MFI MEMBRANES POWER-PLANT CO2 CAPTURE GAS SEPARATION TRANSPORT GROWTH