Benzothiazole- and benzoxazole-linked porous polymers for carbon dioxide storage and separation
Benzothiazole- and benzoxazole-linked porous polymers for carbon dioxide storage and separation
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DOI：
10.1039/c6ta06342j
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发表时间：
2017-01-07
影响因子：
11.9
通讯作者：
El-Kaderi, Hani M.
中科院分区：
文献类型：
--
作者：
Rabbani, Mohammad Gulam;Islamoglu, Timur;El-Kaderi, Hani M.
将亲CO2杂原子（即N、S和O）引入多孔有机聚合物中有助于实现选择性CO2捕获。在这里，我们报告的合成多孔苯并噻唑和苯并恶唑连接的聚合物，分别具有硫和氧原子，除了氮功能。它们的结构性能进行了分析，并比较其类似的苯并咪唑连接的聚合物，只有氮杂原子。该聚合物表现出高表面积（SA（BET）= 698-1011 m（2）g（-1））、高物理化学稳定性和相当大的CO2储存容量。低压气体吸收实验被用来计算小气体分子的结合亲和力，并揭示了聚合物具有高的吸附热（Q（st））CO2（28.7-33.6 kJ mol（-1））。比较的CO2吸收和Qst值的苯并噻唑，苯并恶唑和苯并咪唑连接的聚合物表明，较小的孔有利于CO2吸附与较高的Qst值和总的CO2吸收能力主要取决于表面积提供的孔径是显着小，在较低的CO2区域。报道的聚合物还显示出中等至高的吸附选择性CO2/N-2（40-78）和CO2/CH 4（5.7-7.8），从理想吸附溶液理论（IAST）计算使用纯气体等温线在298 K。
Incorporation of CO2-philic heteroatoms (i.e. N, S, and O) into porous organic polymers has been instrumental in achieving selective CO2 capture. Here, we report the synthesis of porous benzothiazole and benzoxazole linked polymers which have sulfur and oxygen atoms, respectively, in addition to the nitrogen functionality. Their structural properties have been analyzed and compared to their analogous benzimidazole linked polymers which have only nitrogen heteroatoms. The polymers exhibit high surface areas (SA(BET) = 698-1011 m(2) g(-1)), high physicochemical stability, and considerable CO2 storage capacity. Low pressure gas uptake experiments were used to calculate the binding affinity of small gas molecules and revealed that the polymers have high heats of adsorption (Q(st)) for CO2 (28.7-33.6 kJ mol(-1)). Comparison of CO2 uptakes and Qst values of benzothiazole-, benzoxazole-and benzimidazole-linked polymers demonstrated that smaller pores facilitate CO2 adsorption with higher Qst values and the total CO2 uptake capacity mainly depends on the surface areas provided that the pore sizes are significantly small in lower micropore regions. The reported polymers also show moderate to high adsorption selectivity for CO2/N-2 (40-78) and CO2/CH4 (5.7-7.8) as determined from the Ideal Adsorbed Solution Theory (IAST) calculation using pure gas isotherms at 298 K.