{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,6]],"date-time":"2025-11-06T01:06:33Z","timestamp":1762391193226,"version":"build-2065373602"},"reference-count":31,"publisher":"MDPI AG","issue":"24","license":[{"start":{"date-parts":[[2023,12,6]],"date-time":"2023-12-06T00:00:00Z","timestamp":1701820800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Solar-driven Ca-Looping Process for Thermochemical Energy Storage","award":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"],"award-info":[{"award-number":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"]}]},{"DOI":"10.13039\/501100001871","name":"Centro de Qu\u00edmica Estrutural","doi-asserted-by":"publisher","award":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"],"award-info":[{"award-number":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Institute of Molecular Sciences","award":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"],"award-info":[{"award-number":["PTDC\/EAM-PEC\/32342\/2017","UIDB\/00100\/2020","UIDP\/00100\/2020","LA\/P\/0056\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>CO2 uptake by MgO-based sorbents at intermediate temperatures is attractive for pre- and post-combustion CO2 capture applications. However, besides the high CO2 uptake potential of these materials (1.1 g CO2 g\u22121 sorbent), in practice, the realistic CO2 capture is far from that of the theorical values. In this work, the sol\u2013gel method was used to synthetize unsupported and supported MgO sorbents (10% Ca\u2212 or 10% Ce\u2212 support, mol) that were impregnated with different fractions (15, 25, and 35; % mol) of a NaNO3 single salt or a ternary alkali salt (NaNO3, LiNO3 and KNO3 (18\/30\/52; % mol)). To understand the role of alkali metal salts (AMSs) in the MgO sorbents\u2019 performance, the working and decomposition temperature ranges of AMS under different atmospheres (CO2 and air) were evaluated. The findings show that the CO2 uptake temperature range and maximum uptake (20\u2013500 \u00b0C, CO2 atmosphere) of sorbents are correlated. The cyclic CO2 uptake of the most promising sorbents was tested along five carbonation\u2013calcination cycles. For the first and fifth cycles, respectively, the 15 (Na, K, Li)-MgO sorbents showed the highest carrying capacity, i.e., 460\u2013330 mg CO2 g\u22121 sorbent, while for the 15 (Na, K, Li)-MgO-Ca sorbents, it was 375\u2013275 mg CO2 g\u22121. However, after the first cycle, the carbonation occurred faster for the 15 (Na, K, Li)-MgO-Ca sorbents, meaning that it can be a path to overpassing carbonation kinetics limitations of the MgO sorbent, making it viable for industrial applications.<\/jats:p>","DOI":"10.3390\/ma16247539","type":"journal-article","created":{"date-parts":[[2023,12,7]],"date-time":"2023-12-07T03:35:31Z","timestamp":1701920131000},"page":"7539","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Understanding the Role of Mono and Ternary Alkali Metal Salts on CO2 Uptake of MgO Sorbents"],"prefix":"10.3390","volume":"16","author":[{"given":"Patr\u00edcia","family":"Correia","sequence":"first","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Qu\u00edmica, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2568-3974","authenticated-orcid":false,"given":"Carla I. C.","family":"Pinheiro","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Qu\u00edmica, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6137-6664","authenticated-orcid":false,"given":"Paula","family":"Teixeira","sequence":"additional","affiliation":[{"name":"Centro de Qu\u00edmica Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Qu\u00edmica, Instituto Superior T\u00e9cnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2023,12,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"101357","DOI":"10.1016\/j.jcou.2020.101357","article-title":"Magnesium Oxide-Based Adsorbents for Carbon Dioxide Capture: Current Progress and Future Opportunities","volume":"43","author":"Ruhaimi","year":"2021","journal-title":"J. CO2 Util."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"20103","DOI":"10.1039\/C9TA06930E","article-title":"Progress in MgO Sorbents for Cyclic CO2 Capture: A Comprehensive Review","volume":"7","author":"Hu","year":"2019","journal-title":"J. Mater. Chem. A"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"6910","DOI":"10.1021\/acs.energyfuels.8b00866","article-title":"Nanostructured MgO Sorbents Derived from Organometallic Magnesium Precursors for Post-Combustion CO2 Capture","volume":"32","author":"Guo","year":"2018","journal-title":"Energy Fuels"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"154","DOI":"10.1016\/j.matchemphys.2017.06.002","article-title":"Sorption Capacity and Stability of Mesoporous Magnesium Oxide in Post-Combustion CO2 Capture","volume":"198","author":"Ho","year":"2017","journal-title":"Mater. Chem. Phys."},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Teixeira, P., Bacariza, C., Correia, P., Pinheiro, C.I.C., and Cabrita, I. (2022). Hydrogen Production with In Situ CO2 Capture at High and Medium Temperatures Using Solid Sorbents. Energies, 15.","DOI":"10.3390\/en15114039"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"3340","DOI":"10.1039\/D1SE00400J","article-title":"High-Purity H2 production by Sorption-Enhanced Water Gas Shift on a K2CO3-Promoted Cu\/MgO-Al2O3 difunctional Material","volume":"5","author":"Hu","year":"2021","journal-title":"Sustain. Energy Fuels"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"886","DOI":"10.1016\/j.cej.2019.04.080","article-title":"Structural and Kinetic Analysis of CO2 Sorption on NaNO2-Promoted MgO at Moderate Temperatures","volume":"372","author":"Wang","year":"2019","journal-title":"Chem. Eng. J."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"10380","DOI":"10.1039\/c2ra21428h","article-title":"Kinetics Studies on Wet and Dry Gas-Solid Carbonation of MgO and Mg(OH)2 for CO2 Sequestration","volume":"2","author":"Fagerlund","year":"2012","journal-title":"RSC Adv."},{"key":"ref_9","unstructured":"Zhang, K. (2014). Development of Molten Salt Promoted Metal Oxide Based Absorbents for CO2 Separation. [Ph.D. Thesis, University of Connecticut]. Available online: https:\/\/opencommons.uconn.edu\/dissertations\/327."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"8070","DOI":"10.1021\/acs.iecr.6b00647","article-title":"Facile Synthesis of High-Surface-Area Mesoporous MgO with Excellent High-Temperature CO2 Adsorption Potential","volume":"55","author":"Hanif","year":"2016","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"1295","DOI":"10.1021\/acsaem.8b01852","article-title":"CO2 Uptake and Cyclic Stability of MgO-Based CO2 Sorbents Promoted with Alkali Metal Nitrates and Their Eutectic Mixtures","volume":"2","author":"Armutlulu","year":"2019","journal-title":"ACS Appl. Energy Mater."},{"key":"ref_12","unstructured":"Mayorga, S.G., Weigel, S.J., Gaffney, T.R., and Brzozowski, J.R. (2023, June 01). Carbon Dioxide Adsorbents Containing Magnesium Oxide Suitable for Use at High Temperatures. United States, Available online: https:\/\/www.osti.gov\/servlets\/purl\/873949."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1400030","DOI":"10.1002\/admi.201400030","article-title":"Phase Transfer-Catalyzed Fast CO2 Absorption by MgO-Based Absorbents with High Cycling Capacity","volume":"1","author":"Zhang","year":"2014","journal-title":"Adv. Mater. Interfaces"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"367","DOI":"10.1016\/j.cej.2014.07.082","article-title":"Characteristics of Na-Mg Double Salt for High-Temperature CO2 Sorption","volume":"258","author":"Lee","year":"2014","journal-title":"Chem. Eng. J."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"1089","DOI":"10.1021\/acs.jpcc.5b10729","article-title":"Molten Salt Promoting Effect in Double Salt CO2 Absorbents","volume":"120","author":"Zhang","year":"2016","journal-title":"J. Phys. Chem. C"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"216","DOI":"10.1016\/j.cej.2017.09.068","article-title":"Mesoporous MgO Promoted with NaNO3\/NaNO2 for Rapid and High-Capacity CO2 Capture at Moderate Temperatures","volume":"332","author":"Zhao","year":"2018","journal-title":"Chem. Eng. J."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2988","DOI":"10.1002\/cssc.202000259","article-title":"NaNO3-Promoted Mesoporous MgO for High-Capacity CO2 Capture from Simulated Flue Gas with Isothermal Regeneration","volume":"13","author":"Park","year":"2020","journal-title":"ChemSusChem"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1704","DOI":"10.1021\/acs.energyfuels.8b02749","article-title":"Study on MNO3 \/NO2 (M = Li, Na, and K)\/MgO Composites for Intermediate-Temperature CO2 Capture","volume":"33","author":"Gao","year":"2019","journal-title":"Energy Fuels"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"8153","DOI":"10.1021\/acs.chemmater.5b03904","article-title":"Colloidal Nanoclusters of MgO Coated with Alkali Metal Nitrates\/Nitrites for Rapid, High Capacity CO2 Capture at Moderate Temperature","volume":"27","author":"Harada","year":"2015","journal-title":"Chem. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"101725","DOI":"10.1016\/j.jcou.2021.101725","article-title":"Magnesite-Derived MgO Promoted with Molten Salts and Limestone as Highly-Efficient CO2 Sorbent","volume":"53","author":"Papalas","year":"2021","journal-title":"J. CO2 Util."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.cej.2019.04.020","article-title":"Direct Formation of Hierarchically Porous MgO-Based Sorbent Bead for Enhanced CO2 Capture at Intermediate Temperatures","volume":"371","author":"Jin","year":"2019","journal-title":"Chem. Eng. J."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1943","DOI":"10.1021\/cm503295g","article-title":"Alkali Metal Nitrate-Promoted High-Capacity MgO Adsorbents for Regenerable CO2 Capture at Moderate Temperatures","volume":"27","author":"Harada","year":"2015","journal-title":"Chem. Mater."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"77","DOI":"10.1016\/j.apcata.2016.12.019","article-title":"High-Efficiency and Low-Cost Li\/ZnO Catalysts for Synthesis of Glycerol Carbonate from Glycerol Transesterification: The Role of Li and ZnO Interaction","volume":"532","author":"Song","year":"2017","journal-title":"Appl. Catal. A Gen."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"162","DOI":"10.1016\/j.solmat.2012.01.009","article-title":"Thermal Stability of the Eutectic Composition in LiNO3-NaNO3-KNO3 Ternary System Used for Thermal Energy Storage","volume":"100","author":"Wang","year":"2012","journal-title":"Sol. Energy Mater. Sol. Cells"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"654","DOI":"10.1016\/j.egypro.2015.03.075","article-title":"Effect of Heating Rates and Composition on the Thermal Decomposition of Nitrate Based Molten Salts","volume":"69","author":"Gimenez","year":"2015","journal-title":"Energy Procedia"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"1668","DOI":"10.1007\/s11814-014-0116-1","article-title":"High-Temperature CO2 Sorption on Na2CO3-Impregnated Layered Double Hydroxides","volume":"31","author":"Min","year":"2014","journal-title":"Korean J. Chem. Eng."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Shi, L., Qu, T., Liu, D., Deng, Y., Yang, B., and Dai, Y. (2020). Process of Thermal Decomposition of Lithium Carbonate, Springer.","DOI":"10.1007\/978-3-030-36556-1_10"},{"key":"ref_28","unstructured":"Pedrosa, F., Marcelo, T., Nogueira, C.A., Gomes, A., and Diamantino, T. (2018). ECOS 2018\u2014Proceedings of the 31st International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Guimar\u00e3es, Portugal, 17\u201322 June 2018, University of Minho."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1016\/j.ijggc.2012.11.013","article-title":"Roles of Double Salt Formation and NaNO3 in Na2CO3-Promoted MgO Absorbent for Intermediate Temperature CO2 Removal","volume":"12","author":"Zhang","year":"2013","journal-title":"Int. J. Greenh. Gas Control"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1007\/s11705-017-1691-6","article-title":"Al2O3 and CeO2-Promoted MgO Sorbents for CO2 Capture at Moderate Temperatures","volume":"12","author":"Yu","year":"2018","journal-title":"Front. Chem. Sci. Eng."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"18280","DOI":"10.1039\/D0TA06170K","article-title":"Unravelling the Role of Alkaline Earth Metal Carbonates in Intermediate Temperature CO2 capture Using Alkali Metal Salt-Promoted MgO-Based Sorbents","volume":"8","author":"Cui","year":"2020","journal-title":"J. Mater. Chem. A"}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/24\/7539\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T21:34:23Z","timestamp":1760132063000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/16\/24\/7539"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,12,6]]},"references-count":31,"journal-issue":{"issue":"24","published-online":{"date-parts":[[2023,12]]}},"alternative-id":["ma16247539"],"URL":"https:\/\/doi.org\/10.3390\/ma16247539","relation":{},"ISSN":["1996-1944"],"issn-type":[{"type":"electronic","value":"1996-1944"}],"subject":[],"published":{"date-parts":[[2023,12,6]]}}}