Use of Eutectic Mixtures for Preparation of Monolithic Carbons with CO2-Adsorption and Gas-Separation Capabilities

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• 作者：N. L贸pez-Salas ; E. O. Jardim ; A. Silvestre-Albero ; M. C. Guti茅rrez ; M. L. Ferrer ; F. Rodr铆guez-Reinoso ; J. Silvestre-Albero ; F. del Monte
• 刊名：Langmuir
• 出版年：2014
• 出版时间：October 21, 2014
• 年：2014
• 卷：30
• 期：41
• 页码：12220-12228
• 全文大小：462K
• ISSN：1520-5827

文摘

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 鈥渉ighways鈥?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.