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M.E. is grateful for Grant RYC2021-031428-I funded by MCIN/AEI/10.13039/501100011033 and by European Union NextGenerationEU/PRTR. The authors wish to thank Comunidad de Madrid and European Structural Funds for their financial support to ACES2030-CM project (S2018/EMT-4319) .

Analysis of institutional authors

Castro-Yanez, DAuthorErans, MAuthorPeral, AAuthorSanz, RAuthorBriones, LCorresponding AuthorSanz-Perez, E SCorresponding AuthorEscola, J MCorresponding Author
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Article

The key role played by mesoporous alumina as binder for obtaining ultra-hard CaO based pellets for thermochemical heat storage leveraging the CaO/CaCO3 cycle

Publicated to:Journal Of Cleaner Production. 448 141702- - 2024-04-05 448(), DOI: 10.1016/j.jclepro.2024.141702

Authors: Castro-Yanez, D; Erans, M; Peral, A; Sanz, R; Gonzalez-Aguilar, J; Romero, M; Briones, L; Sanz-Perez, E S; Escola, J M

Affiliations

IMDEA Energy Inst, Unit High Temp Proc, Avda Ramon Sagra 3, Mostoles 28935, Spain - Author
Rey Juan Carlos Univ, Grp Chem & Environm Engn, C Tulipan S-N, Mostoles 28933, Spain - Author
Univ Valencia, Dept Chem Engn, Valencia 46100, Spain - Author

Abstract

The synthesis of CaO-based pellets with high energy storage and suitable mechanical resistance after prolonged cycling is pivotal for the successful implementation of the Calcium looping (CaL) technology for energy storage in CSP plants. In this work, CaO-based spherical pellets (CAA) were prepared made up of 60 wt % Ca(OH)2 and varying ratios (0-40 wt %) of commercial gamma-Al2O3 and mesoporous gamma-Al2O3 (m-Al2O3). They were tested in TG in several CO2 carbonation/decarbonation cycles (15 and 50 for selected pellets) and their respective average crushing strengths measured. After 15 cycles, the optimum pellet CAA 20-20 (60 wt % Ca(OH)2/20 wt % gamma-Al2O3/20 wt % m-Al2O3) exhibits a remarkable energy storage density of 1030 kJ/kg with a superb crushing strength of -29 N. This was ascribed to the enhanced formation of the calcium aluminate mayenite (Ca12Al14O33), since the high BET surface area (384 m2 g-1) of mesoporous gamma-Al2O3 promotes the interaction with calcium oxide. Additionally, CAA 20-20 showed meaningful porosity that favored CO2 mass transport. Interestingly, after 50 cycles, the optimum CAA 20-20 pellet maintained a high carbonation yield (0.46), representing an 84 % of the initial value and corresponding to an energy storage density of -873 kJ/kg. Additionally, the optimum CAA 20-20 pellet was coated with an external layer of Al-MCM-41 silica that augmented its crushing strength up to 37 N, with a concurrent slight abatement in the carbonation yield and energy storage density after 50 cycles (0.43 and -824 kJ/kg). Consequently, both uncoated and coated CAA 20-20 pellet are promising for the successful implementation of CaL in CSP plants.

Keywords
AluminaAluminum coatingsAluminum oxideAttritionCalcium based sorbentsCalcium loopingCao/caco3 cycleCao/caco<sub>3</sub> cycleCarbon dioxideCementCo2 captureCompressive strengthConcentrated solar powerCrushingCstDecarbonationEnergy storage densityEnergy-storageEnhancementHeat storageHydrated limeIntegrationLimeMechanical resistanceMesoporousMesoporous aluminaMesoporous materialsPelletizingPerformanceSilicaSodium aluminateSpherical pelletsTechnologiesThermo-chemical heat storagesThermochemical heat storage

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of Cleaner Production due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2024 there are still no calculated indicators, but in 2023, it was in position 13/91, thus managing to position itself as a Q1 (Primer Cuartil), in the category Green & Sustainable Science & Technology.

Independientemente del impacto esperado determinado por el canal de difusión, es importante destacar el impacto real observado de la propia aportación.

Según las diferentes agencias de indexación, el número de citas acumuladas por esta publicación hasta la fecha 2025-05-22:

  • WoS: 4
  • Scopus: 4
Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-22:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 14.
  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 14 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 1.25.
  • The number of mentions on the social network X (formerly Twitter): 2 (Altmetric).
Leadership analysis of institutional authors

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: First Author (Castro Yáñez, David) and Last Author (Escola Sáez, José María).

the authors responsible for correspondence tasks have been Briones Gil, Laura, Sanz Pérez, Eloy Santiago and Escola Sáez, José María.