{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,18]],"date-time":"2026-06-18T06:14:49Z","timestamp":1781763289100,"version":"3.54.5"},"reference-count":37,"publisher":"MDPI AG","issue":"17","license":[{"start":{"date-parts":[[2025,9,2]],"date-time":"2025-09-02T00:00:00Z","timestamp":1756771200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Natural Science Foundation of Wuhan","award":["2023020201010045"],"award-info":[{"award-number":["2023020201010045"]}]},{"name":"Natural Science Foundation of Wuhan","award":["2024CSA088"],"award-info":[{"award-number":["2024CSA088"]}]},{"name":"Natural Science Foundation of Wuhan","award":["2025JYCXJJ046"],"award-info":[{"award-number":["2025JYCXJJ046"]}]},{"name":"Special Funds for Local Scientific and Technological Development by the Central Government of China","award":["2023020201010045"],"award-info":[{"award-number":["2023020201010045"]}]},{"name":"Special Funds for Local Scientific and Technological Development by the Central Government of China","award":["2024CSA088"],"award-info":[{"award-number":["2024CSA088"]}]},{"name":"Special Funds for Local Scientific and Technological Development by the Central Government of China","award":["2025JYCXJJ046"],"award-info":[{"award-number":["2025JYCXJJ046"]}]},{"name":"Huazhong University of Science and Technology Independent Innovation Research Fund","award":["2023020201010045"],"award-info":[{"award-number":["2023020201010045"]}]},{"name":"Huazhong University of Science and Technology Independent Innovation Research Fund","award":["2024CSA088"],"award-info":[{"award-number":["2024CSA088"]}]},{"name":"Huazhong University of Science and Technology Independent Innovation Research Fund","award":["2025JYCXJJ046"],"award-info":[{"award-number":["2025JYCXJJ046"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>High-temperature CaO-based CO2 capture technology, energized by in situ coal combustion, exhibits substantial promise owing to its high energy efficiency, strong compatibility, and maturity. However, sorbent deactivation mechanisms under complex coal combustion conditions, particularly for industrially required pelletized sorbents, are unclear. Pelletized sorbents were co-fired with four representative coals (differing in Na-K, S, and Al-Si content) in this study. Key factors were decoupled, and two competing mechanisms were revealed: (1) High-temperature sintering deactivation: Single co-firing triggers localized overheating (&gt;900 \u00b0C), causing severe sintering and pore collapse. This reduces the specific surface area by 29% and pore volume by 50%, occludes meso-\/macropores, and leads to a significant drop in initial CO2 capture capacity to 0.266\u20130.297 g\/g. Coal types and minor residual surface impurities (&lt;1.7%) are secondary factors. (2) Si-Al ash stabilization: During repeated co-firing (1\u20139 cycles), Si-Al ash components enrich on sorbents (0.1\u20137.6%), forming a thermally protective layer. After 20 adsorption\u2013desorption cycles, the CO2 capture capacity loss drops from 17.6% to 3.9%, improving cycle stability. These findings clarify these dual mechanisms, providing a theoretical basis for system optimization and highlighting precise control of the combustion temperature field as critical for industrial deployment.<\/jats:p>","DOI":"10.3390\/ijms26178535","type":"journal-article","created":{"date-parts":[[2025,9,2]],"date-time":"2025-09-02T15:02:57Z","timestamp":1756825377000},"page":"8535","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Dual Effects of In Situ Coal Combustion on CaO Pellets for CO2 Capture: High-Temperature Sintering and Ash Stabilization"],"prefix":"10.3390","volume":"26","author":[{"given":"Yun","family":"Long","sequence":"first","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Changqing","family":"Wang","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruichang","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Liu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pengxin","family":"Zeng","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zijian","family":"Zhou","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Minghou","family":"Xu","sequence":"additional","affiliation":[{"name":"State Key Laboratory of Coal Combustion, School of Power and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,2]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1647","DOI":"10.1126\/science.1172246","article-title":"Carbon capture and storage: How green can black be?","volume":"325","author":"Haszeldine","year":"2009","journal-title":"Science"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"87","DOI":"10.1016\/j.pecs.2011.05.001","article-title":"Comparative assessment of CO2 capture technologies for carbon-intensive industrial processes","volume":"38","author":"Kuramochi","year":"2012","journal-title":"Prog. Energy Combust. Sci."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"1062","DOI":"10.1039\/C7EE02342A","article-title":"Carbon capture and storage (CCS): The way forward","volume":"11","author":"Bui","year":"2018","journal-title":"Energy Environ. Sci."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1038\/s43017-025-00658-x","article-title":"Global carbon emissions and decarbonization in 2024","volume":"6","author":"Deng","year":"2025","journal-title":"Nat. Rev. Earth Environ."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1016\/j.pecs.2009.10.001","article-title":"The calcium looping cycle for large-scale CO2 capture","volume":"36","author":"Blamey","year":"2010","journal-title":"Prog. Energy Combust. Sci."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"32","DOI":"10.1016\/j.apenergy.2013.12.023","article-title":"Biotemplated synthesis of highly stable calcium-based sorbents for CO2 capture via a precipitation method","volume":"118","author":"Witoon","year":"2014","journal-title":"Appl. Energy"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"7806","DOI":"10.1021\/acs.energyfuels.0c00682","article-title":"Review on the development of sorbents for calcium looping","volume":"34","author":"Chen","year":"2020","journal-title":"Energy Fuels"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"480","DOI":"10.1016\/j.apenergy.2018.10.138","article-title":"A calcium looping process for simultaneous CO2 capture and peak shaving in a coal-fired power plant","volume":"235","author":"Zhou","year":"2019","journal-title":"Appl. Energy"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"787","DOI":"10.1016\/j.apenergy.2015.10.121","article-title":"The Calcium-Looping technology for CO2 capture: On the important roles of energy integration and sorbent behavior","volume":"162","author":"Romeo","year":"2016","journal-title":"Appl. Energy"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1702896","DOI":"10.1002\/adma.201702896","article-title":"Multishelled CaO Microspheres Stabilized by Atomic Layer Deposition of Al2O3 for Enhanced CO2 Capture Performance","volume":"29","author":"Armutlulu","year":"2017","journal-title":"Adv. Mater."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2473","DOI":"10.1021\/ef201543n","article-title":"Effect of temperature on the carbonation reaction of CaO with CO2","volume":"26","author":"Li","year":"2012","journal-title":"Energy Fuels"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.apenergy.2017.03.120","article-title":"The Oxy-CaL process: A novel CO2 capture system by integrating partial oxy-combustion with the Calcium-Looping process","volume":"196","author":"Ortiz","year":"2017","journal-title":"Appl. Energy"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"561","DOI":"10.1016\/j.fuel.2012.04.043","article-title":"Energy penalty of CO2 capture for the carbonation-calcination Reaction (CCR) Process: Parametric effects and comparisons with alternative processes","volume":"104","author":"Wang","year":"2013","journal-title":"Fuel"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"15143","DOI":"10.1021\/acs.iecr.7b03777","article-title":"Impacts and action mechanism of coal ash on CaO-based sorbents for CO2 capture under an oxy-fuel calcination environment","volume":"56","author":"He","year":"2017","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"425","DOI":"10.1002\/ceat.200800590","article-title":"Changes in Limestone Sorbent Morphology during CaO-CaCO3 Looping at Pilot Scale","volume":"32","author":"Hughes","year":"2009","journal-title":"Chem. Eng. Technol."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"169","DOI":"10.1016\/j.apenergy.2018.03.160","article-title":"Integration of the calcium carbonate looping process into an existing pulverized coal-fired power plant for CO2 capture: Techno-economic and environmental evaluation","volume":"222","author":"Rolfe","year":"2018","journal-title":"Appl. Energy"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"200","DOI":"10.1016\/j.fuproc.2018.04.028","article-title":"The effects of water vapor and coal ash on the carbonation behavior of CaO-sorbent supported by \u03b3-Al2O3 for CO2 capture","volume":"177","author":"Chen","year":"2018","journal-title":"Fuel Process. Technol."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"5395","DOI":"10.1021\/acs.iecr.6b04771","article-title":"Pelletizing and coating of synthetic zirconia stabilized calcium-based sorbents for application in calcium looping CO2 capture","volume":"56","author":"Soleimanisalim","year":"2017","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"1046","DOI":"10.1016\/j.fuel.2018.11.123","article-title":"Evaluation of high-temperature CO2 capture performance of cellulose-templated CaO-based pellets","volume":"239","author":"Sun","year":"2019","journal-title":"Fuel"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1016\/j.cej.2015.10.026","article-title":"Enhanced performance of extruded-spheronized carbide slag pellets for high temperature CO2 capture","volume":"285","author":"Sun","year":"2016","journal-title":"Chem. Eng. J."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/S0360-1285(99)00005-2","article-title":"Combustion of agricultural residues","volume":"26","author":"Werther","year":"2000","journal-title":"Prog. Energy Combust. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"5092","DOI":"10.1021\/acs.energyfuels.6b00610","article-title":"Limestone decomposition in an O2\/CO2\/steam atmosphere integrated with coal combustion","volume":"30","author":"Li","year":"2016","journal-title":"Energy Fuels"},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"1008","DOI":"10.1021\/ef3017199","article-title":"Effect of Sulfation during Oxy-Fuel Calcination Stage in Calcium Looping on CO2 Capture Performance of CaO-Based Sorbents","volume":"27","author":"Luo","year":"2013","journal-title":"Energy Fuels"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"1888","DOI":"10.1021\/acs.iecr.6b04234","article-title":"Fly-ash-modified calcium-based sorbents tailored to CO2 capture","volume":"56","author":"Chen","year":"2017","journal-title":"Ind. Eng. Chem. Res."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"725","DOI":"10.1016\/j.cej.2016.10.050","article-title":"The effect of fly ash on reactivity of calcium based sorbents for CO2 capture","volume":"309","author":"Chen","year":"2017","journal-title":"Chem. Eng. J."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"339","DOI":"10.1016\/j.fuproc.2016.09.017","article-title":"Study on the interaction between CaO-based sorbents and coal ash in calcium looping process","volume":"156","author":"He","year":"2017","journal-title":"Fuel Process. Technol."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"273","DOI":"10.1016\/j.powtec.2018.06.011","article-title":"Measuring attrition properties of calcium looping materials in a 30 kW pilot plant","volume":"336","author":"Alonso","year":"2018","journal-title":"Powder Technol."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"16577","DOI":"10.1039\/C4TA03854A","article-title":"A Facile fabrication of mesoporous core\u2013shell CaO-Based pellets with enhanced reactive stability and resistance to attrition in cyclic CO2 capture","volume":"2","author":"Sun","year":"2014","journal-title":"J. Mater. Chem. A"},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"6636","DOI":"10.1021\/acs.energyfuels.5b01419","article-title":"Structurally improved, core-in-shell, CaO-based sorbent pellets for CO2 capture","volume":"29","author":"Sun","year":"2015","journal-title":"Energy Fuels"},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"125737","DOI":"10.1016\/j.seppur.2023.125737","article-title":"Comparative investigation on CO2 uptake performance of limestone-derived sorbents with different supports synthesized by impregnated layer solution combustion method","volume":"332","author":"Wang","year":"2024","journal-title":"Sep. Purif. Technol."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"3977","DOI":"10.1016\/j.proci.2016.09.001","article-title":"Stabilized CO2 capture performance of extruded-spheronized CaO-based pellets by microalgae templating","volume":"36","author":"Sun","year":"2017","journal-title":"Proc. Combust. Inst."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"127529","DOI":"10.1016\/j.seppur.2024.127529","article-title":"Insight into the deactivation mechanism of CaO-based CO2 sorbent under in-situ coal combustion","volume":"346","author":"Kong","year":"2024","journal-title":"Sep. Purif. Technol."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"123757","DOI":"10.1016\/j.seppur.2023.123757","article-title":"Strengthening performance of Al-stabilized, CaO-based CO2 sorbent pellets by the combination of impregnated layer solution combustion and graphite-moulding","volume":"315","author":"Xu","year":"2023","journal-title":"Sep. Purif. Technol."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"115902","DOI":"10.1016\/j.ces.2020.115902","article-title":"General rate equation theory for gas-solid reaction kinetics and its application to CaO carbonation","volume":"227","author":"Li","year":"2020","journal-title":"Chem. Eng. Sci."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"4607","DOI":"10.1021\/ef300607z","article-title":"Rate equation theory for the carbonation reaction of CaO with CO2","volume":"26","author":"Li","year":"2012","journal-title":"Energy Fuels"},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1016\/j.fuel.2013.06.040","article-title":"Understanding the enhancement effect of high-temperature steam on the carbonation reaction of CaO with CO2","volume":"127","author":"Li","year":"2014","journal-title":"Fuel"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"42","DOI":"10.1016\/j.combustflame.2020.03.025","article-title":"The effect of H2O on the oxy-fuel combustion of a bituminous coal char particle in a fluidized bed: Experiment and modeling","volume":"218","author":"Bu","year":"2020","journal-title":"Combust. Flame"}],"container-title":["International Journal of Molecular Sciences"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1422-0067\/26\/17\/8535\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:38:09Z","timestamp":1760035089000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1422-0067\/26\/17\/8535"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,9,2]]},"references-count":37,"journal-issue":{"issue":"17","published-online":{"date-parts":[[2025,9]]}},"alternative-id":["ijms26178535"],"URL":"https:\/\/doi.org\/10.3390\/ijms26178535","relation":{},"ISSN":["1422-0067"],"issn-type":[{"value":"1422-0067","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,9,2]]}}}