A hybrid absorption-adsorption method to efficiently capture carbon.

A hybrid absorption-adsorption method to efficiently capture carbon.
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DOI:
10.1038/ncomms6147
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发表时间:
2014-10-09
影响因子:
16.6
通讯作者:
Wang, Wenchuan
Wang, Wenchuan
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Liu, Huang;Liu, Bei;Lin, Li-Chiang;Chen, Guangjin;Wu, Yuqing;Wang, Jin;Gao, Xueteng;Lv, Yining;Pan, Yong;Zhang, Xiaoxin;Zhang, Xianren;Yang, Lanying;Sun, Changyu;Smit, Berend;Wang, Wenchuan

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Removal of carbon dioxide is an essential step in many energy-related processes. Here we report a novel slurry concept that combines specific advantages of metal-organic frameworks, ion liquids, amines and membranes by suspending zeolitic imidazolate framework-8 in glycol-2-methylimidazole solution. We show that this approach may give a more efficient technology to capture carbon dioxide compared to conventional technologies. The carbon dioxide sorption capacity of our slurry reaches 1.25 mol l−1 at 1 bar and the selectivity of carbon dioxide/hydrogen, carbon dioxide/nitrogen and carbon dioxide/methane achieves 951, 394 and 144, respectively. We demonstrate that the slurry can efficiently remove carbon dioxide from gas mixtures at normal pressure/temperature through breakthrough experiments. Most importantly, the sorption enthalpy is only −29 kJ mol−1, indicating that significantly less energy is required for sorbent regeneration. In addition, from a technological point of view, unlike solid adsorbents slurries can flow and be pumped. This allows us to use a continuous separation process with heat integration. Common approaches for carbon dioxide capture include absorption in amine solutions or adsorption in porous materials. Here, the authors combine these two strategies and report carbon dioxide capture in a slurry of metal-organic frameworks in glycol-2-methylimidazole, which has advantages of both techniques.
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