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CO2 adsorption and catalytic application of Co-MOF-74 synthesized by microwave heating

Paper ID Volume ID Publish Year Pages File Format Full-Text
55498 47056 2012 6 PDF Available
Title
CO2 adsorption and catalytic application of Co-MOF-74 synthesized by microwave heating
Abstract

High-quality Co-MOF-74 crystals were successfully synthesized in 1 h by microwave heating (Co-MOF-74(M)). The XRD pattern and textural properties of Co-MOF-74(M) including the BET surface area (1314 m2 g−1) were virtually identical to those of a sample synthesized in 24 h by the solvothermal method (Co-MOF-74(S), 1327 m2 g−1). Average particle size of the former (ca. 50 μm long and 8 μm wide) was, however, significantly smaller than that of the latter (ca. 300 μm long and 70 μm wide). The H2O adsorption capacities of the crystals at 25 °C were 466 and 605 mg g−1 for Co-MOF-74(M) and Co-MOF-74(S), respectively. The adsorption isotherms of Co-MOF-74(M) for CO2 and N2 showed a high CO2 adsorption capacity (288 mg g−1) and excellent selectivity over N2 (>25:1) at 25 °C. Eight consecutive adsorption–desorption cycles established that there was no deterioration in the adsorption capacity, which showed reversible adsorbent regeneration at 100 °C under He flow for a total duration of 1100 min. Co-MOF-74(M) also demonstrated excellent catalytic performance in cycloaddition of CO2 to styrene oxide under relatively mild reaction conditions (2.0 MPa, 100 °C) with close to 100% selectivity to carbonate confirmed by GC–MS, 1H NMR, and FT-IR. Styrene oxide conversion increased with CO2 pressure and reaction temperature. No appreciable effect of catalyst particle size was detected, and Co-MOF-74(M) could be reused 3 times without loss of catalytic activity and with no structural deterioration.

Graphical abstractHigh-quality Co-MOF-74 crystals were successfully synthesized in 1 h by microwave heating (Co-MOF-74(M)). The average particle size of the product was significantly smaller than solvothermally synthesized sample (Co-MOF-74(S)). The adsorption isotherms of Co-MOF-74(M) for CO2 and N2 showed a high CO2 adsorption capacity (288 mg g−1) and excellent selectivity over N2 (>25:1) at 25 °C. Co-MOF-74(M) also demonstrated excellent catalytic performance in cycloaddition of CO2 to styrene oxide under relatively mild reaction conditions (2.0 MPa, 100 °C) with close to 100% selectivity to carbonate confirmed by GC–MS, 1H NMR, and FT-IR. Styrene oxide conversion increased with CO2 pressure and reaction temperature. No appreciable effect of catalyst particle size was detected, and Co-MOF-74(M) could be reused 3 times without loss of catalytic activity and with no structural deterioration.Figure optionsDownload full-size imageDownload high-quality image (184 K)Download as PowerPoint slideHighlights► Co-MOF-74 was obtained by a microwave-heating method in 1 h. ► High CO2 and water vapor sorption capacities and high CO2 selectivity were obtained. ► Co-MOF-74 was exceptionally effective for cycloaddition of CO2 to styrene oxide. ► Co-MOF-74 catalysts were reusable with retention of high catalytic activity.

Keywords
Co-MOF-74; Microwave heating; CO2 adsorption; CO2 cycloaddition; Styrene oxide
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CO2 adsorption and catalytic application of Co-MOF-74 synthesized by microwave heating
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 185, Issue 1, 20 May 2012, Pages 35–40
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
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Price after discount Only $4.95
100% Money Back Guarantee
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