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.
Highlights
IntroductionWe 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
Removal of carbon dioxide is an essential step in many energy-related processes
Reduction of CO2 emission is directly influenced by the efficiency with which we are able to capture carbon from flue gas and other gas mixtures related to energy generation, such as biogas, integrated gasification combined cycle gas, syngas, shift gas produced from steam reforming of natural gas or coal and natural gas[1,2,3,4]
Summary
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. 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. One can use this tunability to synthesize a material that has exactly the right pore volume, surface area and selectivity to efficiently separate CO2 (refs 9–11).The enthusiasm of the scientific community about MOFs and other nanoporous materials as solid adsorbents, does not yet resonate in the process engineering community[12]. A carefully chosen absorbent/adsorbent combination may lead to a significantly enhanced separation performance, which is denoted as the absorption–adsorption system
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