Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material
Zeolite-like metal-organic frameworks (ZMOFs) can adsorb hydrogen and carbon dioxide because of their negatively charged structures, being able to be ion exchanged with metal cations to further increase the electrostatic field inside the framework cavities. Ion exchange of RhoZMOF with alkaline and...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
2012-09-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.30.8-9.793 |
| _version_ | 1797282022115246080 |
|---|---|
| author | Guillermo Calleja Juan A. Botas Carmen Martos Gisela Orcajo José. A. Villajos |
| author_facet | Guillermo Calleja Juan A. Botas Carmen Martos Gisela Orcajo José. A. Villajos |
| author_sort | Guillermo Calleja |
| collection | DOAJ |
| description | Zeolite-like metal-organic frameworks (ZMOFs) can adsorb hydrogen and carbon dioxide because of their negatively charged structures, being able to be ion exchanged with metal cations to further increase the electrostatic field inside the framework cavities. Ion exchange of RhoZMOF with alkaline and alkaline-earth metal cations was performed up to stoichiometric levels with one single ion-exchange step. Screen effect caused by water-coordinated molecules around the exchanged cations hindered the hydrogen uptake, although slightly higher heats of hydrogen adsorption were observed for Na + , Li + , Mg 2+ and Ca 2+ exchanged samples. Conversely, the same exchange treatment produced a very interesting enhancement in CO 2 adsorption of RhoZMOF at 303 K. Moreover, because there are no water molecules surrounding the metallic cations, RhoZMOF material was exchanged with an Li + –crown–ether complex in the nitrobenzene/acetonitrile mixture, free of water. Nitrogen and hydrogen adsorption isotherms at 77 K showed higher specific surface area and hydrogen adsorption capacity than the material with hydrated cations. |
| first_indexed | 2024-03-07T17:04:53Z |
| format | Article |
| id | doaj.art-6e1eb36f7d954633a9a20e974ccf40a0 |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T17:04:53Z |
| publishDate | 2012-09-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-6e1eb36f7d954633a9a20e974ccf40a02024-03-03T02:41:58ZengSAGE PublicationsAdsorption Science & Technology0263-61742048-40382012-09-013010.1260/0263-6174.30.8-9.793Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF MaterialGuillermo CallejaJuan A. BotasCarmen MartosGisela OrcajoJosé. A. VillajosZeolite-like metal-organic frameworks (ZMOFs) can adsorb hydrogen and carbon dioxide because of their negatively charged structures, being able to be ion exchanged with metal cations to further increase the electrostatic field inside the framework cavities. Ion exchange of RhoZMOF with alkaline and alkaline-earth metal cations was performed up to stoichiometric levels with one single ion-exchange step. Screen effect caused by water-coordinated molecules around the exchanged cations hindered the hydrogen uptake, although slightly higher heats of hydrogen adsorption were observed for Na + , Li + , Mg 2+ and Ca 2+ exchanged samples. Conversely, the same exchange treatment produced a very interesting enhancement in CO 2 adsorption of RhoZMOF at 303 K. Moreover, because there are no water molecules surrounding the metallic cations, RhoZMOF material was exchanged with an Li + –crown–ether complex in the nitrobenzene/acetonitrile mixture, free of water. Nitrogen and hydrogen adsorption isotherms at 77 K showed higher specific surface area and hydrogen adsorption capacity than the material with hydrated cations.https://doi.org/10.1260/0263-6174.30.8-9.793 |
| spellingShingle | Guillermo Calleja Juan A. Botas Carmen Martos Gisela Orcajo José. A. Villajos Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material Adsorption Science & Technology |
| title | Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material |
| title_full | Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material |
| title_fullStr | Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material |
| title_full_unstemmed | Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material |
| title_short | Effect of Ion-Exchange Modification on Hydrogen and Carbon Dioxide Adsorption Behaviour of RhoZMOF Material |
| title_sort | effect of ion exchange modification on hydrogen and carbon dioxide adsorption behaviour of rhozmof material |
| url | https://doi.org/10.1260/0263-6174.30.8-9.793 |
| work_keys_str_mv | AT guillermocalleja effectofionexchangemodificationonhydrogenandcarbondioxideadsorptionbehaviourofrhozmofmaterial AT juanabotas effectofionexchangemodificationonhydrogenandcarbondioxideadsorptionbehaviourofrhozmofmaterial AT carmenmartos effectofionexchangemodificationonhydrogenandcarbondioxideadsorptionbehaviourofrhozmofmaterial AT giselaorcajo effectofionexchangemodificationonhydrogenandcarbondioxideadsorptionbehaviourofrhozmofmaterial AT joseavillajos effectofionexchangemodificationonhydrogenandcarbondioxideadsorptionbehaviourofrhozmofmaterial |