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

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• 作者：Hye-Young Cho^a ; Da-Ae Yang^a ; Jun Kim^a ; Soon-Yong Jeong^b ; Wha-Seung Ahn^a ; ^{whasahn@inha.ac.kr}
• 关键词：Co-MOF-74 ; Microwave heating ; CO2 adsorption ; CO2 cycloaddition ; Styrene oxide
• 刊名：Catalysis Today
• 出版年：2012
• 期刊代码：13_09205861
• 类别：ce
• 出版时间：20 May, 2012
• 卷：185
• 期：1
• 页码：35-40
• 文件大小：781 K

摘要

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^鈭?) were virtually identical to those of a sample synthesized in 24 h by the solvothermal method (Co-MOF-74(S), 1327 m² g^鈭?). Average particle size of the former (ca. 50 渭m long and 8 渭m wide) was, however, significantly smaller than that of the latter (ca. 300 渭m long and 70 渭m wide). The H₂O adsorption capacities of the crystals at 25 掳C were 466 and 605 mg g^鈭? 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^鈭?) and excellent selectivity over N₂ (>25:1) at 25 掳C. Eight consecutive adsorption-desorption cycles established that there was no deterioration in the adsorption capacity, which showed reversible adsorbent regeneration at 100 掳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 掳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.