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CO₂ capture and conversion using Mg-MOF-74 prepared by a sonochemical method
Summary:
The authors from Inha University, Republic of Korea: developed Mg-MOF-74(S) via a rapid sonochemical route, achieving simultaneous CO₂ capture (350 mg g⁻¹) and catalytic conversion to cyclic carbonate with 95 % yield under mild conditions.
Background:
1. To address energy-intensive amine scrubbing and low-activity heterogeneous catalysts for CO₂ utilization, previous works synthesized MOFs solvothermally, yet suffered from long crystallization times and limited mesoporosity.
2. The authors proposed a 1 h sonochemical method with triethylamine deprotonation, obtaining smaller (0.6 mm) Mg-MOF-74(S) crystals with auxiliary mesopores and intact open-metal sites.
Research Content:
1. Synthesis: Sonochemical treatment (20 kHz, 500 W, 1 h) of Mg(NO₃)₂·6H₂O and H₄dhtp in DMF/EtOH/H₂O with TEA, followed by methanol exchange and 523 K activation.
2. Characterizations:
1) BET 1690 m² g⁻¹; 0.31 cm³ g⁻¹ mesopores (BJH).
2) SEM shows uniform 0.6 mm spheres vs 14 mm cauliflower for solvothermal counterpart.
3) CO₂ Qst 42–22 kJ mol⁻¹; reversible 10-cycle TGA; breakthrough 179 mg g⁻¹ from 15 % CO₂/N₂.
3. Application: Adsorbent gives 179 mg g⁻¹ CO₂ capacity; catalyst converts styrene oxide → 4-phenyl-1,3-dioxolan-2-one, 95 % yield (2 MPa, 373 K, 4 h, no co-catalyst).
4. Mechanism: Open Mg²⁺ Lewis acid sites activate epoxide; adjacent linker oxygens act as internal Lewis base, synergistically fixing CO₂ into cyclic carbonate without external additives.
Outlook:
Mg-MOF-74(S) offers a scalable, additive-free platform integrating high-capacity CO₂ adsorption with efficient in-situ catalytic fixation, paving the way for low-energy carbon-capture-and-utilization technologies.
CO₂ capture and conversion using Mg-MOF-74 prepared by a sonochemical method
Authors: Da-Ae Yang, Hye-Young Cho, Jun Kim, Seung-Tae Yang, Wha-Seung Ahn
DOI: 10.1039/C1EE02234B
Link: https://pubs.rsc.org/en/content/articlelanding/2012/ee/c1ee02234b
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