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论文类型：期刊论文

发表时间：2019-12-06

发表刊物：CHEMSUSCHEM

收录刊物：PubMed、EI、SCIE

卷号：12

期号：23

页面范围：5164-5171

ISSN号：1864-5631

关键字：absorption; amines; carbon dioxide; environmental chemistry; viscosity

摘要：The exponentially increasing viscosity of water-lean CO2 absorbents during carbon capture processes is a critical problem for practical application, owing to its strong correlation with systems' mass transfer properties, as well as convenience of transportation. In this work, a concise strategy based on structure-viscosity relationships is proposed and applied to construct a series of functionalized ethylenediamines as single-component absorbents for post-combustion CO2 capture. These nonaqueous absorbents have outstanding viscosities (50-200 cP, 25 degrees C) at their maximal CO2 capacities (up to 22 wt% or 4.92 mol kg(-1), 1 bar), and are readily regenerated at low temperatures (50-80 degrees C) under ambient pressure. Additional capture of CO2 through physisorption could also be achieved by operating at high pressures. The CO2 capture and release process is systematically investigated by means of C-13 NMR spectroscopy, differential scanning calorimetry (DSC), in situ FTIR analysis, and density functional theory (DFT) calculations, which could provide sufficient spectroscopic details to reveal the ease of reversibility and enable rational interpretation of the absorption mechanism.