دورية أكاديمية
Insights into structure and reactivity of MOFs by ambient pressure soft X-ray absorption spectroscopy
| العنوان: | Insights into structure and reactivity of MOFs by ambient pressure soft X-ray absorption spectroscopy |
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| المؤلفون: | Tofoni A., Tavani F., Braglia L., Colombo V., Torelli P., D'Angelo P. |
| المساهمون: | A. Tofoni, F. Tavani, L. Braglia, V. Colombo, P. Torelli, P. D'Angelo |
| بيانات النشر: | Elsevier Science Limited |
| سنة النشر: | 2023 |
| المجموعة: | The University of Milan: Archivio Istituzionale della Ricerca (AIR) |
| مصطلحات موضوعية: | AP-NEXAFS, Carbon dioxide, Gas sorption, Material, MOF, Operando, Settore CHIM/03 - Chimica Generale e Inorganica, Settore CHIM/02 - Chimica Fisica |
| الوصف: | Metal–Organic Frameworks (MOFs) are nanostructured porous materials made up by metal cations and organic linkers forming three-dimensional structures. Since their discovery, the local properties of metal centers in MOFs have often been studied with hard X-ray absorption spectroscopy that is not a surface sensitive technique. Here, we employ the ambient-pressure soft X-ray absorption spectroscopy, using a newly developed experimental setup, to unveil the formation mechanism of surface defective sites in the prototypical Cu(II)- based MOF HKUST-1, as well as the reactivity and selectivity of these sites towards CO2 from the analysis of the Cu L3-edge near edge X-ray absorption spectroscopy (NEXAFS) data. We observe that, upon thermal heating, Cu(I) defects are formed more abundantly on the surface of the material as compared to the bulk, a process that is almost fully reversed when the MOF is exposed to CO2, even when mixed with H2. Additionally, we propose a structure and a formation mechanism for such defective sites, supported by theoretical DFT-based calculations. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | volume:213; firstpage:1; lastpage:6; numberofpages:6; journal:RADIATION PHYSICS AND CHEMISTRY; https://hdl.handle.net/2434/1007131Test; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85170436115 |
| DOI: | 10.1016/j.radphyschem.2023.111243 |
| الإتاحة: | https://doi.org/10.1016/j.radphyschem.2023.111243Test https://hdl.handle.net/2434/1007131Test |
| حقوق: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.CB356AFC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1016/j.radphyschem.2023.111243 |
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