State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, P. R. China.
Department of Chemical and Biomolecular Engineering, University of California, Berkeley, California 94720, USA.
Nat Commun. 2014 Oct 9;5:5147. doi: 10.1038/ncomms6147.
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.
二氧化碳的去除是许多能源相关过程中的一个重要步骤。在这里，我们报告了一种新颖的浆液概念，通过将沸石咪唑酯骨架-8 悬浮在乙二醇-2-甲基咪唑溶液中，结合了金属有机骨架、离子液体、胺和膜的特定优势。我们表明，与传统技术相比，这种方法可能提供更有效的二氧化碳捕集技术。我们的浆液的二氧化碳吸附容量在 1 巴时达到 1.25 mol·l(-1)，二氧化碳/氢气、二氧化碳/氮气和二氧化碳/甲烷的选择性分别达到 951、394 和 144。我们通过突破实验证明，该浆液可以在常压/温度下从气体混合物中有效地去除二氧化碳。最重要的是，吸附焓仅为-29 kJ·mol(-1)，这表明再生吸附剂所需的能量显著减少。此外，从技术角度来看，与固体吸附剂不同，浆液可以流动和泵送。这允许我们使用具有热集成的连续分离过程。
