Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA.
Nat Commun. 2011 Jul 19;2:401. doi: 10.1038/ncomms1405.
Carbon dioxide capture from point sources like coal-fired power plants is considered to be a solution for stabilizing the CO(2) level in the atmosphere to avoid global warming. Methane is an important energy source that is often highly diluted by nitrogen in natural gas. For the separation of CO(2) and CH(4) from N(2) in flue gas and natural gas, respectively, sorbents with high and reversible gas uptake, high gas selectivity, good chemical and thermal stability, and low cost are desired. Here we report the synthesis and CO(2), CH(4), and N(2) adsorption properties of hierarchically porous electron-rich covalent organonitridic frameworks (PECONFs). These were prepared by simple condensation reactions between inexpensive, commercially available nitridic and electron-rich aromatic building units. The PECONF materials exhibit high and reversible CO(2) and CH(4) uptake and exceptional selectivities of these gases over N(2). The materials do not oxidize in air up to temperature of 400 °C.
从燃煤电厂等点源捕获二氧化碳被认为是稳定大气中二氧化碳水平以避免全球变暖的一种解决方案。甲烷是一种重要的能源，通常在天然气中被氮气高度稀释。为了分别从烟道气和天然气中分离 CO(2)和 CH(4)与 N(2)，需要具有高且可还原的气体吸收、高气体选择性、良好的化学和热稳定性以及低成本的吸附剂。在这里，我们报告了具有分级多孔富电子共价有机氮化物骨架（PECONF）的合成以及 CO(2)、CH(4)和 N(2)吸附性能。这些是通过在廉价、市售的氮化物和富电子芳香族构筑单元之间进行简单的缩合反应制备的。PECONF 材料表现出高且可还原的 CO(2)和 CH(4)吸收以及这些气体相对于 N(2)的优异选择性。这些材料在空气中在高达 400°C 的温度下不会氧化。
