Synthesis of functionalized 3D microporous carbon foams for selective CO2 capture
Synthesis of functionalized 3D microporous carbon foams for selective CO2 capture
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DOI：
10.1016/j.cej.2020.125459
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发表时间：
2020-12
影响因子：
15.1
通讯作者：
Xin Liu;Shaobo Wang;Cheng-gong Sun;Hao Liu;Lee Stevens;Priscilla Kesewaa Dwomoh;C. Snape
中科院分区：
文献类型：
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作者：
Xin Liu;Shaobo Wang;Cheng-gong Sun;Hao Liu;Lee Stevens;Priscilla Kesewaa Dwomoh;C. Snape
多孔碳材料被认为是燃烧后二氧化碳捕获的有前途的介质。开发和设计具有高吸附能力和低CO2分压下对其他气体的CO2选择性的经济有效的碳已引起越来越多的关注。在这项研究中，使用廉价且市售的聚异氰脲酸酯泡沫（PIR）作为前体，通过简便的一步化学活化工艺制备了一类功能化3D微孔碳泡沫。碳泡沫的多孔结构和表面化学可以通过调节活化温度和KOH/PIR质量比来定制。在 25℃和 CO2 分压为 0.15 bar 的条件下，FC7001 的碳泡沫具有最高的微孔体积（<0.44 nm）和理想的表面化学性质，表现出极高的 CO2 吸收量，为 2.3 mmol/g，而 FC6001 具有以 0.37 nm 为中心的纯单孔径，表现出最高的亨利定律 CO2/N2 选择性，为 200。 此外，在较高的活化温度和KOH/前驱体比例下制备的碳泡沫在20巴的CO2压力和环境温度下获得了19mmol/g的高CO2吸收容量，并且具有2207m2/g的高表面积和0.876cm3/g的微孔体积。先进的表征证实，独特的超微孔结构和表面化学源于表面骨架离子形式的插层钾，控制着碳泡沫在低 CO2 分压下的选择性 CO2 吸附，而高微孔体积决定了高 CO2 压力下的 CO2 吸附。这项工作通过生产高效的二氧化碳吸附剂，为回收聚异氰脲酸酯泡沫提供了一条潜在的新途径。
Porous carbon materials have been considered as the promising media for post combustion CO2capture. Development and design of cost-effective carbons with high adsorption capacity and selectivity of CO2over other gases at low CO2partial pressures has attracted increasing attention. In this study, a category of functionalized 3D microporous carbon foam was prepared by using inexpensive and commercially available polyisocyanurate foam (PIR) as the precursor via a facile one-step chemical activation process. The porous structure and surface chemistry of the carbon foams can be tailored by adjusting the activation temperature and KOH/PIR mass ratio. At 25 ℃ and a CO2partial pressure of 0.15 bar, the carbon foam of FC7001 with highest volume of fine micropores (<0.44 nm) and desirable surface chemistry exhibited exceptionally high CO2uptake of 2.3 mmol/g whereas FC6001, which had a pure single pore size centered at 0.37 nm, showed highest Henry’s law CO2/N2selectivity of 200. Furthermore, high CO2uptake capacity of 19 mmol/g at CO2pressure of 20 bar and ambient temperature was obtained for the carbon foam prepared at a higher activation temperature and KOH/precursor ratio and with a high surface area of 2207 m2/g and micropore volume of 0.876 cm3/g. Advanced characterization confirmed that the unique ultra-microporous structure and surface chemistry originated from intercalated potassium in the form of surface extra-framework ions governed the selective CO2adsorption of the carbon foams at low CO2partial pressures whilst the high micropore volume determined the CO2adsorption at high CO2pressure. This work provides a potentially new pathway to recycle polyisocyanurate foams by producing efficient CO2adsorbents.