Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios
We investigated the hydrogen-adsorption properties of four zeolites (FAU-, MFI-, *BEA- and MOR-type zeolites) with various Si/Al ratios and charge cations (H + Li + or Na + ), focusing particularly on the measurements of isosteric heat of adsorption (Q st ). The profiles of Q st describe the heterog...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2014-05-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.32.5.413 |
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| author | Masaru Kubo Yoshihiro Kamimura Keiji Itabashi Tatsuya Okubo |
| author_facet | Masaru Kubo Yoshihiro Kamimura Keiji Itabashi Tatsuya Okubo |
| author_sort | Masaru Kubo |
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| description | We investigated the hydrogen-adsorption properties of four zeolites (FAU-, MFI-, *BEA- and MOR-type zeolites) with various Si/Al ratios and charge cations (H + Li + or Na + ), focusing particularly on the measurements of isosteric heat of adsorption (Q st ). The profiles of Q st describe the heterogeneity of the zeolite surface. Zeolites with narrower pore channel (2.6 ∞ 5.7 Å) exhibit higher initial Q st values than zeolites with wide pore channel (7.4 ∞ 7.4 Å), because of the strong dispersion interaction between hydrogen molecules and the surface of the pore channel. Li-exchanged zeolites exhibit high initial Q st values; however, the 6-membered ring zeolite frameworks adsorb less hydrogen at 77 K and 0.1 MPa than Na-exchanged zeolites, because Li cations, unlike larger Na cations, can penetrate the ring, and thus become less accessible to hydrogen molecules. The enhancement of hydrogen uptake for Li-exchanged zeolites correlates with the amount of Li + . |
| format | Article |
| id | doaj-art-e64ce53c94a44281a5c6b79ec33bc8fc |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2014-05-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-e64ce53c94a44281a5c6b79ec33bc8fc2025-01-03T01:19:32ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382014-05-013210.1260/0263-6174.32.5.413Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al RatiosMasaru Kubo0Yoshihiro Kamimura1Keiji ItabashiTatsuya Okubo Department of Chemical Engineering, Faculty of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan. ‡National Institute of Advanced Industrial Science and Technology (AIST), AIST Central 5-2, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan Department of Chemical System Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, JapanWe investigated the hydrogen-adsorption properties of four zeolites (FAU-, MFI-, *BEA- and MOR-type zeolites) with various Si/Al ratios and charge cations (H + Li + or Na + ), focusing particularly on the measurements of isosteric heat of adsorption (Q st ). The profiles of Q st describe the heterogeneity of the zeolite surface. Zeolites with narrower pore channel (2.6 ∞ 5.7 Å) exhibit higher initial Q st values than zeolites with wide pore channel (7.4 ∞ 7.4 Å), because of the strong dispersion interaction between hydrogen molecules and the surface of the pore channel. Li-exchanged zeolites exhibit high initial Q st values; however, the 6-membered ring zeolite frameworks adsorb less hydrogen at 77 K and 0.1 MPa than Na-exchanged zeolites, because Li cations, unlike larger Na cations, can penetrate the ring, and thus become less accessible to hydrogen molecules. The enhancement of hydrogen uptake for Li-exchanged zeolites correlates with the amount of Li + .https://doi.org/10.1260/0263-6174.32.5.413 |
| spellingShingle | Masaru Kubo Yoshihiro Kamimura Keiji Itabashi Tatsuya Okubo Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios Adsorption Science & Technology |
| title | Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios |
| title_full | Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios |
| title_fullStr | Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios |
| title_full_unstemmed | Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios |
| title_short | Cryogenic Hydrogen Adsorption onto H-, Li-, Na-Exchanged Zeolites with Various Si/Al Ratios |
| title_sort | cryogenic hydrogen adsorption onto h li na exchanged zeolites with various si al ratios |
| url | https://doi.org/10.1260/0263-6174.32.5.413 |
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