|Title:||A hybrid absorption-adsorption method to efficiently capture carbon||Authors:||Liu H.
|Keywords:||adsorbent;amine;carbon dioxide;hydrogen;ion;metal organic framework;methane;nitrogen;sorbent;carbon dioxide;enthalpy;experimental study;hydrogen;methane;nitrogen;separation;slurry;sorption;zeolite;absorption;adsorption;Article;atmospheric pressure;enthalpy;gas;infrared radiation;pressure;Raman spectrometry;regeneration;scanning electron microscopy;solubility;temperature;X ray diffraction||Issue Date:||2014||Journal Volume:||5||Source:||Nature Communications||Abstract:||
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. ? 2014 Macmillan Publishers Limited. All rights reserved.
|Appears in Collections:||化學工程學系|
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