Abstract:

Three-way rod metal-organic framework—3W-ROD-1 was prepared by solvothermal method using In(NO₃)₃·4H₂O and H₃L, with nitric acid serving as the template. This material possessed a permanent pore structure and exhibited a relatively high specific surface area, reaching up to 2742m²/g,along with a pore volume of 1.11cm³/g. Owing to its unique structural characteristics, the adsorption capacity of 3W-ROD-1 for propane, ethane, and methane were 8.74mmol/g, 3.62mmol/g, and 0.44mmol/g, respectively. Notably, the adsorption capacity of propane ranked at the forefront among similar materials. Through IAST (ideal adsorption solution theory) selective calculation, the adsorption selectivities of C₃H₈/CH₄, C₂H₆/CH₄ at 298K and 1bar were calculated to be 87.0 (C₃H₈∶CH₄=15∶85) and 9.5 (C₂H₆∶CH₄=15∶85), respectively. Dynamic breakthrough separation experiments further verified its excellent separation performance for the propane/methane, ethane/methane, and propane/ethane/methane mixed systems. In the three components separation of propane/ethane/methane (V/V/V=5/10/85), the breakthrough times were 50min, 11.5min and 3min, respectively. These findings convincingly demonstrated the potential application value of this material in the field of natural gas purification.

Key words: rod metal-organic framework, natural gas, separation, methane

摘要：

利用硝酸铟和酰胺三酸配体H₃L，以硝酸作为模板剂，采用溶剂热法制备出三种朝向的链基有机骨架材料——3W-ROD-1。该材料具有永久孔隙结构，表现出较高比表面积达2742m²/g，孔体积为1.11cm³/g。由于其独特的结构特征，在298K、1bar条件下，研究了3W-ROD-1对丙烷、乙烷、甲烷的气体吸附。其中，3W-ROD-1对丙烷、乙烷、甲烷吸附量分别为8.74mmol/g、3.62mmol/g、0.44mmol/g，丙烷吸附量在同类材料中位居前列。通过理想吸附溶液理论（IAST）选择性计算得出，在298K、1bar条件下，C₃H₈/CH₄和C₂H₆/CH₄的吸附选择性分别为87.0（C₃H₈∶CH₄=15∶85）和9.5（C₂H₆∶CH₄=15∶85）。动态穿透分离实验进一步验证了其对丙烷/甲烷、乙烷/甲烷、丙烷/乙烷/甲烷混合体系具有良好的分离性能，在丙烷/乙烷/甲烷（体积比5∶10∶85）三组分分离中，丙烷、乙烷和甲烷的突破时间分别为50min、11.5min和3min。结果表明该材料在天然气纯化方面具有潜在的应用价值。

关键词: 链基有机金属骨架材料, 天然气, 分离, 甲烷