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CO2 Capture through Integration of Aqueous and Immobilized Deep Eutectic Solvents
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0002-8946-9491
2024 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The growing global concern over rising CO2 emissions and its significant impact on climate change highlight the urgent need for efficient CO2 capture technologies. Among the array of techniques employed for this purpose, chemical absorption stands out, characterized by high capture capacity, promising efficiency, and versatile applicability. In this context, Ionic liquids (ILs) and their analogs, deep eutectic solvents (DES), have emerged as promising alternatives to conventional solvents due to their low vapor pressures, high thermal stability, and chemical tunability. However, they also face challenges of high viscosity and cost. Studies have identified two promising strategies to address these limitations: (i) using low-viscous solvents to mix with ILs/DESs and (ii) immobilizing ILs/DESs over a large surface (solid porous materials) to develop composites. The goal of this thesis was to integrate these two strategies to develop an innovative sorbent with enhanced CO2 capture capacity while improving kinetics. The main progress achieved in this thesis is as follows:

In the first part, ILs/DESs were screened from the properties where a literature survey was combined with COSMO-RS for different IL/DES-based technologies. One DES was selected. To study the CO2 capture using immobilized ILs/DESs, porous adsorbents were evaluated based on a literature survey by considering the surface area, pore size/volume, stability, availability, and price. Mesoporous silica was selected as a suitable substrate for immobilization. 

In the second part, a range of aqueous DESs was developed based on the molar ratio of DES components and water content for CO2 capture. Then, the CO2 capture capacity and viscosity of aqueous DESs (before and after absorption) were systematically evaluated and compared with a commercial absorbent. An optimal solution was then selected to achieve a balance between higher CO2 capture capacity and lower viscosity. Additionally, absorption kinetics, recyclability, and the effect of temperature on CO2 capture capacity were studied.

In the third part, studies were directed towards the novel strategy, i.e., developing sorbent via integrating aqueous and immobilized DESs, i.e., slurry. To this end, DES was immobilized into mesoporous silica at different loadings and mixed with the aqueous DES. Their CO2 capture capacity was measured and the optimal slurry, selected based on CO2 capture performance, underwent further analysis to evaluate kinetics, recyclability, and temperature effect on performance and obtained results were compared with a commercial solvent. 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2024.
Series
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
Keywords [en]
CO2 capture, Ionic liquid, Deep eutectic solvent, Immobilization, Slurry
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
URN: urn:nbn:se:ltu:diva-105045ISBN: 978-91-8048-526-5 (print)ISBN: 978-91-8048-527-2 (electronic)OAI: oai:DiVA.org:ltu-105045DiVA, id: diva2:1850193
Presentation
2024-06-05, E632, Luleå University of Technology, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2024-04-10 Created: 2024-04-09 Last updated: 2024-05-07Bibliographically approved
List of papers
1. Reviewing and screening ionic liquids and deep eutectic solvents for effective CO2 capture
Open this publication in new window or tab >>Reviewing and screening ionic liquids and deep eutectic solvents for effective CO2 capture
2022 (English)In: Frontiers in Chemistry, E-ISSN 2296-2646, Vol. 10, article id 951951Article, review/survey (Refereed) Published
Abstract [en]

CO2 capture is essential for both mitigating CO2 emissions and purifying/conditioning gases for fuel and chemical production. To further improve the process performance with low environmental impacts, different strategies have been proposed, where developing liquid green absorbent for capturing CO2 is one of the effective options. Ionic liquids (IL)/deep eutectic solvents (DES) have recently emerged as green absorbents with unique properties, especially DESs also benefit from facile synthesis, low toxicity, and high biodegradability. To promote their development, this work summarized the recent research progress on ILs/DESs developed for CO2 capture from the aspects of those physical- and chemical-based, and COSMO-RS was combined to predict the properties that are unavailable from published articles in order to evaluate their performance based on the key properties for different IL/DES-based technologies. Finally, top 10 ILs/DESs were listed based on the corresponding criteria. The shared information will provide insight into screening and further developing IL/DES-based technologies for CO2 capture.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2022
Keywords
ionic liquid, deep eutectic solvents, CO2 capture, COSMO-RS, green absorbents
National Category
Energy Engineering Other Environmental Engineering Other Chemical Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-92835 (URN)10.3389/fchem.2022.951951 (DOI)000844308600001 ()36034653 (PubMedID)2-s2.0-85136581680 (Scopus ID)
Funder
Swedish Energy Agency
Note

Validerad;2022;Nivå 2;2022-09-07 (joosat);

Available from: 2022-09-07 Created: 2022-09-07 Last updated: 2024-04-09Bibliographically approved
2. Development of Monoethanolamine Chloride-Ethylene Diamine Deep Eutectic Solvent for Ffficient Carbon Dioxide Capture
Open this publication in new window or tab >>Development of Monoethanolamine Chloride-Ethylene Diamine Deep Eutectic Solvent for Ffficient Carbon Dioxide Capture
2024 (English)In: Separation and Purification Technology, ISSN 1383-5866, E-ISSN 1873-3794, Vol. 347, article id 127593Article in journal (Refereed) Published
Abstract [en]

Deep eutectic solvents (DES) emerge as a compelling class of ionic liquids, with distinct advantages over traditional solvents, particularly in the realm of CO2 capture. In the present study, [MEACl][EDA] is synthesized across various molar ratios (1:3 to 1:10) and combined with the results of Differential Scanning Calorimetry (DSC) to identify DESs. The DESs are further characterized using Fourier Transform Infrared Spectroscopy (FTIR), and the properties and performance of the DESs with diverse water contents (30–60 wt%) are systematically studied for CO2 capture. The optimal aqueous solution is identified based on the CO2 uptake and viscosity, followed by the evaluation of the cyclic absorption experiments. Results demonstrate that 40 wt% of [MEACl][EDA] DES with (1:5) molar ratio exhibits higher CO2 uptake (22.09 wt%) and comparable viscosity (4.401 mPa·s before and 13.330 mPa·s after CO2 capture at 25 °C) compared to aqueous 40 wt% MEA (15.74 wt% CO2 capture capacity, viscosity of 3.318 mPa·s before and 8.413 mPa·s after CO2 capture), and its absorption rate is also more favorable than the aqueous MEA. Furthermore, recycling studies reveal ∼ 88 % regeneration of the aqueous DES solution at 100 °C.

Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
CO2 uptake, Absorption capacity, Deep eutectic solvent, Aqueous, Regeneration
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-105043 (URN)10.1016/j.seppur.2024.127593 (DOI)
Funder
Swedish Energy Agency, 2020-90040The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), CH2019-8287Bio4EnergySwedish Research Council, 2020-03899
Note

Validerad;2024;Nivå 2;2024-05-08 (joosat);

Full text: CC BY License;

This article has previously appeared as a manuscript in a thesis.

Available from: 2024-04-09 Created: 2024-04-09 Last updated: 2024-05-08Bibliographically approved
3. Developing slurry based on immobilized and aqueous [MEACl][EDA] for CO2 capture
Open this publication in new window or tab >>Developing slurry based on immobilized and aqueous [MEACl][EDA] for CO2 capture
(English)Manuscript (preprint) (Other academic)
National Category
Energy Engineering
Research subject
Energy Engineering
Identifiers
urn:nbn:se:ltu:diva-105044 (URN)
Available from: 2024-04-09 Created: 2024-04-09 Last updated: 2024-05-07

Open Access in DiVA

The full text will be freely available from 2024-12-01 09:00
Available from 2024-12-01 09:00

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Foorginezhad, Sahar

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