Hybrid Bimetallic Metal鈥揙rganic Frameworks: Modulation of the Framework Stability and Ultralarge CO2 Uptake Capacity

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• 作者：Xiaokai Song ; Minhak Oh ; Myoung Soo Lah
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：October 7, 2013
• 年：2013
• 卷：52
• 期：19
• 页码：10869-10876
• 全文大小：510K
• 年卷期：v.52,no.19(October 7, 2013)
• ISSN：1520-510X

文摘

A series of isostructural hybrid bimetallic metal鈥搊rganic frameworks (MOFs), Ni_xM_1鈥?i>x-ITHDs [M = Zn(II), Co(II)], have been prepared via a conventional solvothermal reaction in the presence of varying mole ratios of Ni(II)/Zn(II) or Ni(II)/Co(II) mixed metal ions. While a critical amount of the doped Ni(II) ion (more than 鈮?.2 mol fraction) is needed to have any enhancement of the framework stability of the hybrid bimetallic Ni_xZn_1鈥?i>x-ITHDs, even a very small amount of the doped Ni(II) ion (鈮?.1 mol fraction) produced a full enhancement of the framework stability of the hybrid bimetallic Ni_xCo_1鈥?i>x-ITHDs. The highly porous and rigid Ni_xCo_1鈥?i>x-ITHDs activated via a conventional vacuum drying process shows a Brunauer鈥揈mmett鈥揟eller specific surface area of 5370 m² g^鈥?, which is comparable to that of pure Ni-ITHD. The CO₂ uptake capacities of Ni-ITHD and Ni_0.11Co_0.89-ITHD (2.79 and 2.71 g g^鈥?, respectively) at 1 bar and 195 K are larger than those of any other reported MOFs under similar conditions and the excess CO₂ uptake capacity at 40 bar and 295 K (鈮?.50 g g^鈥?) is comparable to those of other MOFs, which are activated via the supercritical carbon dioxide drying process, with similar pore volumes.