Synthesis and gas permeation properties of chabazite-type titanosilicate membranes synthesized using nano-sized seed crystals

• Material Type: 文書・図像類
• Title: Synthesis and gas permeation properties of chabazite-type titanosilicate membranes synthesized using nano-sized seed crystals
• Author/Editor: Araki, Sadao; Ishii, Hiroyasu; Imasaka, Satoshi; 山本, 秀樹
• Author Heading: Araki, Sadao; Ishii, Hiroyasu; Imasaka, Satoshi; 山本, 秀樹
• Publication, Distribution, etc.: Elsevier
• Publication Date: 2020-01-15
• Publication Date (W3CDTF): 2020-01-15
• Periodical title: Microporous and Mesoporous Materials
• No. or year of volume/issue: 292
• Volume: 292
• ISSN (Periodical Title): ISSN : 13871811
• Text Language Code: eng
• Subject Heading: Titanosilicate; chabazite-type zeolite; zeolite membrane; CO2 separation; 関西大学; Kansai University; 関西大学若手研究者育成経費
• Target Audience: 一般
• Note (General): Chabazite (CHA)-type zeolite membranes have received considerable attention regarding their high permeance and separation performance. A recent report detailing a unique preparation procedure for a CHA-type titanosilicate (Ti-CHA) zeolite—in which titanium heteroatoms were incorporated into the zeolite framework by substitution of aluminum—demonstrates excellent physico-chemical properties when compared with conventional aluminosilicate CHA-type zeolites. In this study, the synthesis of Ti-CHA zeolite membranes (Ti-CHA membrane) was investigated. The Ti-CHA membrane was synthesized on an alumina support via a secondary growth method using Ti-CHA zeolite seed crystals. The Ti-CHA membrane properties were studied as a function of seed crystal size. The average particle diameter was observed to reduce from 2.3 μm to 450 nm by increasing the loading of Ti-CHA into the synthesis gel. Regardless of the seed crystal particle size, the presence of CHA-type zeolites on the alumina support was confirmed by x-ray diffraction. UV-Vis demonstrated the incorporation of titanium heteroatoms into the zeolite framework. The results indicated the successful synthesis of the Ti-CHA membrane regardless of the seed crystal particle size. Additionally, the membrane thickness decreased by using the seed crystal. Single gas permeation tests showed that the thinnest Ti-CHA membrane prepared in this study exhibited a relatively high CO2 permeance of 1.5×10−6 mol m−2 s−1 Pa−1, compared with that of previously reported CHA-type zeolite membranes. The influence of moisture on the separation performance of the Ti-CHA membrane was evaluated in the presence of gas mixtures composed of CO2, methane and H2O ranging from 0.1 to 5 vol.%. In the presence of 1 vol.% H2O, the CO2 permeance and selectivity were only marginally reduced as a result of the highly hydrophobic pore structure.; This work was partially supported by Kansai University Fund for Supporting Young Scholars, 2018.
• Format (IMT): application/pdf
• Source: KU-0020-20190000-01.pdf; https://kansai-u.repo.nii.ac.jp/record/13580/files/KU-0020-20190000-01.pdf
• Access Restrictions: 限定公開
• Rights (production): © 2020. Licensed under the Creative Commons http://creativecommons.org/licenses/by-nc-nd/4.0/.
• Is Version Of (DOI): 10.1016/j.micromeso.2019.109798
• Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）; https://irdb.nii.ac.jp
• Original Data Provider (Database): 関西大学 : 関西大学学術リポジトリ