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首页> 外文期刊>RSC Advances >Effect of pendant isophthalic acid moieties on the adsorption properties of light hydrocarbons in HKUST-1-like tbo-MOFs: application to methane purification and storage
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Effect of pendant isophthalic acid moieties on the adsorption properties of light hydrocarbons in HKUST-1-like tbo-MOFs: application to methane purification and storage

机译：间苯二酸侧基部分对HKUST-1类tbo-MOFs中轻烃吸附特性的影响：在甲烷纯化和存储中的应用

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摘要

Equilibrium adsorption of methane (CH4), C2+ gases (ethane (C2H6), ethylene (C2H4), propane (C3H8), and propylene (C3H6)), and carbon dioxide (CO2) was measured on a series of tbo-MOFs (topological analogues of the prototypical MOF, HKUST-1, correspondingly dubbed tbo-MOF-1), which were developed via the supermolecular building layer (SBL) pillaring strategy. Specifically, tbo-MOF-2 and its isoreticular, functionalized analogue, tbo-MOF-2-{CH2O[Ph(CO2H)(2)]}(2) (or tbo-MOF-3), which is characterized by pendant isophthalic acid moieties freely pointing into the cavities, were evaluated on the basis of potential use in methane storage and C2+/CH4 separation. The parent, tbo-MOF-2, showed high gravimetric and volumetric CH4 uptake, close to the U.S. Department of Energy (DOE) target for methane storage at 35 bar and room temperature. Though the presence of the pendant isophthalic acid moiety in the analogous compound, tbo-MOF-3, led to a decrease in total CH4 uptake, due mainly to the reduced size of the cavities, interestingly, it increased the affinity of the SBL-based tbo-MOF platform for propane, propene, ethane, and ethylene at low pressures compared with CH4, due additionally to the enhanced interactions of the highly polarizable light hydrocarbons with the isophthalic acid moiety. Using Ideal Adsorption Solution Theory (IAST), the predicted mixture adsorption equilibria for the C3H8/CH4, C3H6/CH4, C2H6/CH4, C2H4/CH4, and C-3 H-8/CO2 systems showed high adsorption selectivity for C2+ over methane for tbo-MOF-3 compared with tbo-MOF-2. The high working storage capacity of tbo-MOF-2 and the high affinity of tbo-MOF-3 for C2+ over CH4 and CO2 make tbo-MOF an ideal platform for studies in gas storage and separation.
机译：在一系列tbo-MOF上测量了甲烷（CH4），C2 +气体（乙烷（C2H6），乙烯（C2H4），丙烷（C​​3H8）和丙烯（C3H6））和二氧化碳（CO2）的平衡吸附（拓扑原型MOF的类似物HKUST-1（对应称为tbo-MOF-1）是通过超分子建筑层（SBL）分级策略开发的。具体来说，tbo-MOF-2及其同位网状功能化类似物tbo-MOF-2- {CH2O [Ph（CO2H）（2）]}（2）（或tbo-MOF-3），其特征在于侧邻苯二甲酸根据可能在甲烷存储和C2 + / CH4分离中的潜在用途，评估了自由指向空腔的酸性部分。母体tbo-MOF-2显示出很高的重量和体积CH4吸收率，接近美国能源部（DOE）在35 bar和室温下储存甲烷的目标。尽管类似化合物tbo-MOF-3中存在间苯二甲酸侧链部分，但由于孔腔尺寸减小，导致总CH4吸收量减少，有趣的是，它增加了基于SBL的亲和力与CH4相比，tbo-MOF平台在低压下可用于丙烷，丙烯，乙烷和乙烯，这是由于高度可极化的轻质烃与间苯二甲酸部分之间的相互作用增强。使用理想吸附溶液理论（IAST），对于C3H8 / CH4，C3H6 / CH4，C2H6 / CH4，C2H4 / CH4和C-3 H-8 / CO2系统的预测混合物吸附平衡显示出对甲烷的高吸附选择性tbo-MOF-3与tbo-MOF-2比较。 tbo-MOF-2的高工作存储容量以及tbo-MOF-3对CH2和CO2上C2 +的高亲和力使tbo-MOF成为气体存储和分离研究的理想平台。

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