A hybrid absorption-adsorption method to efficiently capture carbon
Journal
Nature Communications
Journal Volume
5
Date Issued
2014
Author(s)
Liu H.
Liu B.
Lin L.-C.
Chen G.
Wu Y.
Wang J.
Gao X.
Lv Y.
Pan Y.
Zhang X.
Zhang X.
Yang L.
Sun C.
Smit B.
Wang W.
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.
Subjects
adsorbent
amine
carbon dioxide
hydrogen
ion
metal organic framework
methane
nitrogen
sorbent
enthalpy
experimental study
separation
slurry
sorption
zeolite
absorption
adsorption
Article
atmospheric pressure
gas
infrared radiation
pressure
Raman spectrometry
regeneration
scanning electron microscopy
solubility
temperature
X ray diffraction
SDGs
Type
journal article