Synthesis and Characterization of Porous Benzimidazole-Linked Polymers and Their Performance in Small Gas Storage and Selective Uptake
Synthesis and Characterization of Porous Benzimidazole-Linked Polymers and Their Performance in Small Gas Storage and Selective Uptake
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DOI：
10.1021/cm300407h
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发表时间：
2012-04-24
影响因子：
8.6
通讯作者：
El-Kaderi, Hani M.
中科院分区：
文献类型：
--
作者：
Rabbani, Mohammad Gulam;El-Kaderi, Hani M.
含有富氮结构单元的多孔有机聚合物是用于选择性捕获和分离二氧化碳最有前景的材料之一，这对环境和清洁能源应用具有切实的影响。在此，我们报道了四种新型的苯并咪唑连接的多孔聚合物（BILPs）的合成与表征，并评估了它们在小分子气体储存（H₂、CH₄、CO₂）以及对N₂和CH₄的选择性CO₂吸附方面的性能。BILPs是通过芳基邻二胺和芳基醛结构单元之间的缩合反应以良好的产率合成的。所得的BILPs具有适中的表面积（比表面积 = 599 - 1306 m²/g）、高化学和热稳定性，以及显著的气体吸附量和选择性。在273 K下基于初始斜率计算，BILP - 2的选择性最高：CO₂/N₂（113）和CO₂/CH₄（17），而BILP - 4的储存容量最高：CO₂（273 K和1 bar下为24 wt%）和H₂（77 K和1 bar下为2.3 wt%）。这些选择性和气体吸附量是迄今为止已知的多孔有机聚合物中最高的，再加上BILPs显著的化学和物理稳定性，使得这类材料在未来的气体储存和分离应用中非常有前景。
Porous organic polymers containing nitrogen-rich building units are among the most promising materials for selective CO2 capture and separation which can have a tangible impact on the environment and clean energy applications. Herein we report on the synthesis and characterization of four new porous benzimidazole-linked polymers (BILPs) and evaluate their performance in small gas storage (H-2, CH4, CO2) and selective CO2 binding over N-2 and CH4. BILPs were synthesized in good yields by the condensation reaction between aryl-o-diamine and aryl-aldehyde building blocks. The resulting BILPs exhibit moderate surface area (SA(BET) = 599-1306 m(2) g(-1)), high chemical and thermal stability, and remarkable gas uptake and selectivity. The highest selectivity based on initial slope calculations at 273 K was observed for BILP-2: CO2/N-2 (113) and CO2/CH4 (17), while the highest storage capacity was recorded for BILP-4: CO2 (24 wt % at 273 K and 1 bar) and H-2 (2.3 wt % at 77 K and 1 bar). These selectivities and gas uptakes are among the highest by porous organic polymers known to date which in addition to the remarkable chemical and physical stability of BILPs make this class of material very promising for future use in gas storage and separation applications.