Gas and Steam Permeation Properties of Cation-Exchanged ZSM-5 Membrane.

IF 3.6 4区工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2025-03-01 DOI:10.3390/membranes15030070

Yuichiro Hirota, Masaki Nakai, Kasumi Tani, Koya Sakane, Ayumi Ikeda, Yasuhisa Hasegawa, Sadao Araki

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Abstract

NaZSM-5 powder and membranes were hydrothermally prepared. Their (1) steam (H₂O) adsorption properties and (2) the permeation and separation of gas and H₂O were evaluated before and after the cation exchange of Na⁺ to K⁺ or Cs⁺. The quantity of adsorbed H₂O 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 H₂ and N₂ 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 H₂O permeance values of the ZSM-5 membranes before and after K⁺ or Cs⁺ exchange was lower than that of H₂, resulting in improved H₂O/H₂ separation performance. Compared with the NaZSM-5 membrane, the K⁺- or Cs⁺-exchanged ZSM-5 membranes exhibited superior H₂O permselectivity, particularly at dilute H₂O concentrations (<1 vol%).

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阳离子交换ZSM-5膜的气体和蒸汽渗透性能。

采用水热法制备了NaZSM-5粉末和膜。评价了它们(1)对水蒸气（H2O）的吸附性能和(2)对气体和H2O的渗透分离性能。吸附H2O的量随着阳离子尺寸的增大而减小，说明阳离子交换后ZSM-5的微孔体积和有效孔径减小。阳离子交换后H2和N2的渗透率均小于阳离子交换前的5%，表明气体渗透率明显降低。相比之下，在K+或Cs+交换前后，ZSM-5膜的H2O渗透率降低值低于H2，从而提高了水/H2分离性能。与NaZSM-5膜相比，K+或Cs+交换的ZSM-5膜表现出更好的水选择性，特别是在稀水浓度下(

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来源期刊

Membranes Chemical Engineering-Filtration and Separation

CiteScore

6.10

自引率

16.70%

发文量

1071

审稿时长

11 weeks

期刊介绍： Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.