Selective carbon dioxide adsorption of ε-Keggin-type zincomolybdate-based purely-inorganic 3D frameworks
Selective carbon dioxide adsorption of ε-Keggin-type zincomolybdate-based purely-inorganic 3D frameworks
复制标题
ε-Keggin型钼酸锌基纯无机3D框架的选择性二氧化碳吸附
DOI：
10.1039/c4ta05496b
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发表时间：
2015
影响因子：
11.9
通讯作者：
and Wataru Ueda
中科院分区：
文献类型：
--
作者：
Zhenxin Zhang;Masahiro Sadakane;Shin-ichiro Noro;Toru Murayama;Takashi Kamachi;Kazunari Yoshizawa;and Wataru Ueda
以中等产率合成了多草酸盐基三维骨架Na1.5H11.4[ZnMo 12 O 40 {Zn 2}]·5.5H2O和（NH 4）1.5H8.5[ZnMo 12 O 40 {Zn 2}]·6 H2O。在水热条件下旋转反应器对于提高产率是必要的。该材料显示出类似沸石的选择性分子吸附性能。根据材料的孔径大小，小分子可以吸附在材料中，而大分子不能。吸附焓和密度泛函理论计算表明，由于材料与分子间的静电相互作用，材料与CO2的相互作用较强，而与CH 4的相互作用较弱。CO2/CH 4共吸附实验表明，该材料对CO2具有选择性吸附，且含钠离子的材料对CO2的吸附选择性高于含铵离子的材料。该含钠离子的材料可用于气相色谱分离CH 4和CO2。
Polyoxometalate-based 3D frameworks, Na1.5H11.4[ZnMo12O40{Zn2}]·5.5H2O and (NH4)1.5H8.5[ZnMo12O40{Zn2}]·6H2O, are synthesized in moderate yields. Rotation of the reactor under hydrothermal conditions is essential to improve the yield. The materials show zeolite-like selective molecule adsorption properties. Depending on the micropore aperture size of the materials, small molecules can be adsorbed in the materials, while large molecules cannot. The enthalpy of adsorption and DFT calculation indicate that the materials strongly interact with CO2, but weakly interact with CH4, due to electrostatic interactions between the materials and molecules. CO2/CH4 co-sorption experiments show that the materials can selectively adsorb CO2, and CO2 adsorption selectivity of the material with sodium cations is higher than that of the material with ammonium cations. The material with sodium ions can be utilized for gas chromatographic separation of CH4 and CO2.