López-Salas N, Jardim E O, Silvestre-Albero A, Gutiérrez M C, Ferrer M L, Rodríguez-Reinoso F, Silvestre-Albero J, del Monte F
Instituto de Ciencia de Materiales de Madrid-ICMM, Consejo Superior de Investigaciones Científicas-CSIC , Campus de Cantoblanco, 28049 Madrid, Spain.
Langmuir. 2014 Oct 21;30(41):12220-8. doi: 10.1021/la5034146. Epub 2014 Oct 9.
With global warming becoming one of the main problems our society is facing nowadays, there is an urgent demand to develop materials suitable for CO2 storage as well as for gas separation. Within this context, hierarchical porous structures are of great interest for in-flow applications because of the desirable combination of an extensive internal reactive surface along narrow nanopores with facile molecular transport through broad "highways" leading to and from these pores. Deep eutectic solvents (DESs) have been recently used in the synthesis of carbon monoliths exhibiting a bicontinuous porous structure composed of continuous macroporous channels and a continuous carbon network that contains a certain microporosity and provides considerable surface area. In this work, we have prepared two DESs for the preparation of two hierarchical carbon monoliths with different compositions (e.g., either nitrogen-doped or not) and structure. It is worth noting that DESs played a capital role in the synthesis of hierarchical carbon monoliths not only promoting the spinodal decomposition that governs the formation of the bicontinuous porous structure but also providing the precursors required to tailor the composition and the molecular sieve structure of the resulting carbons. We have studied the performance of these two carbons for CO2, N2, and CH4 adsorption in both monolithic and powdered form. We have also studied the selective adsorption of CO2 versus CH4 in equilibrium and dynamic conditions. We found that these materials combined a high CO2-sorption capacity besides an excellent CO2/N2 and CO2/CH4 selectivity and, interestingly, this performance was preserved when processed in both monolithic and powdered form.
随着全球变暖成为当今社会面临的主要问题之一，迫切需要开发适用于二氧化碳储存以及气体分离的材料。在此背景下，分级多孔结构因其在流入应用中具有理想的特性而备受关注，即沿狭窄纳米孔具有广泛的内部反应表面，同时分子可通过通向和来自这些孔的宽阔“通道”进行便捷传输。近年来，深共晶溶剂（DESs）已被用于合成具有双连续多孔结构的碳块体，该结构由连续的大孔通道和包含一定微孔率并提供相当大表面积的连续碳网络组成。在这项工作中，我们制备了两种DESs，用于制备两种具有不同组成（例如，是否掺杂氮）和结构的分级碳块体。值得注意的是，DESs在分级碳块体的合成中发挥了关键作用，不仅促进了控制双连续多孔结构形成的旋节线分解，还提供了用于调整所得碳的组成和分子筛结构所需的前体。我们研究了这两种碳在整体和粉末形式下对二氧化碳、氮气和甲烷吸附的性能。我们还研究了在平衡和动态条件下二氧化碳对甲烷的选择性吸附。我们发现这些材料除了具有优异的二氧化碳/氮气和二氧化碳/甲烷选择性外，还具有高二氧化碳吸附容量，有趣的是，当以整体和粉末形式加工时，这种性能得以保留。
