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CO2capture and conversion using Mg-MOF-74 prepared by a sonochemical method
Abstract
Mg-MOF-74 crystals were successfully prepared in 1 h by a sonochemical method (Mg-MOF-74(S)) after triethylamine (TEA) was added as a deprotonating agent. Mg-MOF-74(S) (1640 m2 g−1 BET surface area) displayed similar textural properties to those of a high-quality MOF sample synthesized in 24 h by the solvothermal method (Mg-MOF-74(C), 1525 m2 g−1). However, mesopores were formed, probably due to the competitive binding of TEA to Mg2+ ions, and the average particle size of the former (ca. 0.6 μm) was significantly smaller than that of the latter (ca. 14 μm). The H2O adsorption capacity was 593 mL g−1 at 298 K for Mg-MOF-74(S), displaying higher hydrophilicity than Zeolite 13X. The adsorption isotherms of Mg-MOF-74(S) for CO2 showed high adsorption capacity (350 mg g−1 at 298 K) and high isosteric heats of adsorption for CO2 (42 to 22 kJ mol−1). The breakthrough experiment confirmed excellent selectivity to CO2 over N2 at ambient conditions (saturation capacity of ca. 179 mg g−1). Ten consecutive adsorption–desorption cycles at 298 K established no deterioration of the adsorption capacity, which showed reversible adsorbent regeneration at 323 K under helium flow for a total duration of 1400 min. Mg-MOF-74(S) also demonstrated excellent catalytic performance in cycloaddition of CO2 to styrene oxide under relatively mild reaction conditions (2.0 MPa, 373 K) with close to 100% selectivity to carbonate, which was confirmed by GC-MS, 1H-NMR, and FT-IR. Mg-MOF-74(S) could be reused 3 times without losing catalytic activity and with no structural deterioration.
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Metadata
- Authors
- Yang, D.-A., Cho, H.-Y., Kim, J., Yang, S.-T., & Ahn, W.-S.
- Venue
- Energy Environ. Sci.
- Publisher
- Royal Society of Chemistry (RSC)
- Published
- 2012
- Volume
- 5
- Issue
- 4
- Pages
- 6465-6473
- ISSN
- 1754-5692 (ISSN-L)
- 1754-5706
- OpenAlex
- W1964344603
- Cited by
- 585
- References
- 69
- FWCI
- 38.13
- Type
- journal article
- Language
- en
- Open access
- closed
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