Jang, Eunhee Lee, Jeong Hyeon Hong, Sungwon Jeong, Yanghwan Kim, Jin Chul Kim, Dongjae Baik, Hionsuck Kim, Eunjoo Choi, Nakwon Nam, Jaewook Cho, Sung June Kwak, Sang Kyu Choi, Jungkyu 2024-01-19T17:02:44Z 2024-01-19T17:02:44Z 2021-09-04 2020-07-28 2050-7488 https://pubs.kist.re.kr/handle/201004/118356 Despite the success of several types of homogeneous zeolite membranes, the manufacturing based on only one type of zeolite largely limits the flexible, reliable synthetic route toward the formation of continuous zeolite membranes. Herein, we demonstrate heterogeneous epitaxial growth of a seed layer using two structurally compatible zeolites. Specifically, MCM-22 (MWW type zeolites) seed layers were epitaxially grown with a synthetic precursor that leads to the DDR type zeolite. The resulting heterogeneous films, referred to as DDR@MWW hybrid films, were continuously formed on porous supports. Furthermore, heteroepitaxial growth of thec-oriented MCM-22 seed layer yielded a preferentialc-out-of-plane orientation; accordingly, six membered-ring (6-MR) pores (having a maximum size of similar to 0.28 nm) along thec-axis of the MWW and DDR zeolites were, for the first time, aligned in the out-of-plane direction. Subsequently, this good model sample was adopted for determining the H-2-permselectivities of the 6-MR pores; surprisingly, the 6-MR pores were rather impermeable to both H(2)and CO(2)molecules up to similar to 200 degrees C so that thec-oriented hybrid membrane exhibited modest CO2-permselectivities over N-2(0.364 nm) or CH4(0.38 nm) at the expense of reduced CO(2)molar flux. Lastly, this experimental observation was further complemented with rigorous molecular dynamics simulations on well-designed DDR zeolite membranes. English ROYAL SOC CHEMISTRY HETEROEPITAXIAL GROWTH HYDROGEN SEPARATION MOLECULAR-HYDROGEN PERFORMANCE MCM-22 GAS FILMS MFI PERVAPORATION DEPOSITION An unprecedented c-oriented DDR@MWW zeolite hybrid membrane: new insights into H-2-permselectivities via six membered-ring pores Article 10.1039/d0ta03892j 1 JOURNAL OF MATERIALS CHEMISTRY A, v.8, no.28, pp.14071 - 14081 JOURNAL OF MATERIALS CHEMISTRY A 8 28 14071 14081 scie scopus 000551538000018 2-s2.0-85088699171 Chemistry, Physical Energy & Fuels Materials Science, Multidisciplinary Chemistry Energy & Fuels Materials Science Article HETEROEPITAXIAL GROWTH HYDROGEN SEPARATION MOLECULAR-HYDROGEN PERFORMANCE MCM-22 GAS FILMS MFI PERVAPORATION DEPOSITION