Chalcogenide Aerogels as Sorbents for Noble Gases (Xe, Kr)
| Autor: | Praveen K. Thallapally, Pantelis N. Trikalitis, Mercouri G. Kanatzidis, Jaehun Chun, Brian J. Riley, Kota S. Subrahmanyam, Ioannis Spanopoulos |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
chemistry.chemical_classification
Materials science Sulfide Chalcogenide Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Chalcogel chemistry.chemical_compound Adsorption chemistry Antimony Molybdenum General Materials Science Gas separation 0210 nano-technology Selectivity |
| Zdroj: | ACS applied materialsinterfaces. 9(39) |
| ISSN: | 1944-8252 |
| Popis: | High-surface-area molybdenum sulfide (MoSx) and antimony sulfide (SbSx) chalcogels were studied for Xe/Kr gas separation. The intrinsic soft Lewis basic character of the chalcogel framework is a unique property among the large family of porous materials and lends itself to a potential new approach toward the selective separation of Xe over Kr. Among these chalcogels, MoSx shows the highest Xe and Kr uptake, reaching 0.69 mmol g–1 (1.05 mmol cm–3) and 0.28 mmol g–1 (0.42 mmol cm–3) respectively, at 273 K and 1 bar. The corresponding isosteric heat of adsorption at zero coverage (Qst0) is 22.8 and 18.6 kJ mol–1 and both are the highest among the selected chalcogels. The IAST (10:90) Xe/Kr selectivity at 273 K for MoSx is 6.0, whereas for SbSx chalcogels, it varies in the range 2.0–2.8. The higher formal charge of molybdenum, Mo4+, in MoSx versus that of antimony, Sb3+, in SbSx coupled with its larger atomic size could induce higher polarizability in the MoSx framework and therefore higher Xe/Kr selectivity. |
| Databáze: | OpenAIRE |
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