Gas and Steam Permeation Properties of Cation-Exchanged ZSM-5 Membrane
NaZSM-5 powder and membranes were hydrothermally prepared. Their (1) steam (H<sub>2</sub>O) adsorption properties and (2) the permeation and separation of gas and H<sub>2</sub>O were evaluated before and after the cation exchange of Na<sup>+</sup> to K<sup>+</sup> or Cs<sup>+</sup>. The quantity of adsorbed H<sub>2</sub>O decreased as the size of the cation increased, indicating that the micropore volume and effective pore size of ZSM-5 decreased after cation exchange. The H<sub>2</sub> and N<sub>2</sub> permeances after cation exchange were less than 5% of the values before cation exchange, indicating a significant reduction in gas permeability. In contrast, the reduction of the H<sub>2</sub>O permeance values of the ZSM-5 membranes before and after K<sup>+</sup> or Cs<sup>+</sup> exchange was lower than that of H<sub>2</sub>, resulting in improved H<sub>2</sub>O/H<sub>2</sub> separation performance. Compared with the NaZSM-5 membrane, the K<sup>+</sup>- or Cs<sup>+</sup>-exchanged ZSM-5 membranes exhibited superior H<sub>2</sub>O permselectivity, particularly at dilute H<sub>2</sub>O concentrations (<1 vol%).
Authors
- Sadao Araki (ORCID: https://orcid.org/0000-0002-2169-1926)
- Yasuhisa Hasegawa (ORCID: https://orcid.org/0000-0001-8851-3561)
- Kazue Tani
- Masaaki Nakai (ORCID: https://orcid.org/0000-0002-5307-2230)
- Yuichiro Hirota (ORCID: https://orcid.org/0000-0002-2397-249X)
- Ayumi Ikeda
- Kohji Sakane
Institutions
- Nagoya Institute of Technology (JP)
- Kansai University (JP)
- National Institute of Advanced Industrial Science and Technology (JP)
Publication Details
- Journal
- Membranes
- Published
- 2025-03-01
- DOI
- https://doi.org/10.3390/membranes15030070
- Citations
- 3
- Primary Topic
- Zeolite Catalysis and Synthesis
- Type
- article
- Field-Weighted Citation Impact
- 1.61
Funders
- Japan Society for the Promotion of Science