Department of Chemical & Environmental Sciences, University of Limerick, Plassey House, Limerick (Republic of Ireland).
Materials & Surface Science Institute, University of Limerick, Plassey House, Limerick (Republic of Ireland).
Angew Chem Int Ed Engl. 2015 Nov 23;54(48):14372-7. doi: 10.1002/anie.201506952. Epub 2015 Oct 6.
Sequestration of CO2, either from gas mixtures or directly from air (direct air capture, DAC), could mitigate carbon emissions. Here five materials are investigated for their ability to adsorb CO2 directly from air and other gas mixtures. The sorbents studied are benchmark materials that encompass four types of porous material, one chemisorbent, TEPA-SBA-15 (amine-modified mesoporous silica) and four physisorbents: Zeolite 13X (inorganic); HKUST-1 and Mg-MOF-74/Mg-dobdc (metal-organic frameworks, MOFs); SIFSIX-3-Ni, (hybrid ultramicroporous material). Temperature-programmed desorption (TPD) experiments afforded information about the contents of each sorbent under equilibrium conditions and their ease of recycling. Accelerated stability tests addressed projected shelf-life of the five sorbents. The four physisorbents were found to be capable of carbon capture from CO2-rich gas mixtures, but competition and reaction with atmospheric moisture significantly reduced their DAC performance.
二氧化碳的捕集，无论是从气体混合物中直接捕集（直接空气捕集，DAC），都可以减少碳排放。在这里，研究了五种材料，以考察它们从空气中和其他气体混合物中直接吸附 CO2 的能力。所研究的吸附剂是基准材料，包括四种类型的多孔材料、一种化学吸附剂、TEPA-SBA-15（胺改性介孔硅）和四种物理吸附剂：沸石 13X（无机）；HKUST-1 和 Mg-MOF-74/Mg-dobdc（金属有机骨架，MOFs）；SIFSIX-3-Ni（混合超微孔材料）。程序升温脱附（TPD）实验提供了有关平衡条件下每种吸附剂含量及其易于回收的信息。加速稳定性测试解决了这五种吸附剂的预计货架寿命问题。发现这四种物理吸附剂能够从富含 CO2 的气体混合物中捕获碳，但与大气湿度的竞争和反应显著降低了它们的 DAC 性能。
