To maintain the carbon dioxide concentration below the no-return threshold for climate change, we must consider the reduction in anthropic emissions coupled to carbon capture methods applied in synergy. In our recent papers, we proposed a green and reliable method for carbon mineralization using ascorbic acid aqueous solution as the reducing agent for carbon (IV) to carbon (III), thus obtaining oxalic acid exploiting green reagents. Oxalic acid is made to mineralize as calcium (as the model cation) oxalate. Oxalates are solid-state reservoirs suitable for long-term carbon storage or carbon feedstock for manufacturing applications. The carbon mineralization reaction is a double-step process (carbon reduction and oxalate precipitation), and the carbon capture efficiency is invariably represented by a double-slope curve we formerly explained as a decrease in the reducing effectiveness of ascorbic acid during reaction. In the present paper, we demonstrated that the reaction proceeds via a “pure CO2-capture” stage in which ascorbic acid oxidizes into dehydroascorbic acid and carbon (IV) reduces to carbon (III) and a “mixed” stage in which the redox reaction competes with the degradation of ascorbic acid in producing oxalic acid. Despite the irreversibility of the reduction reaction, that was demonstrated in abiotic conditions, the analysis of costs according to the market price of the reagents endorses the application of the method.

Metal Oxalates as a CO2 Solid State Reservoir: The Carbon Capture Reaction

Pastero, Linda
Membro del Collaboration Group
;
Barella, Vittorio
Membro del Collaboration Group
;
Pazzi, Marco
Membro del Collaboration Group
;
Sordello, Fabrizio
Membro del Collaboration Group
;
Wehrung, Quentin
Membro del Collaboration Group
;
Pavese, Alessandro
Membro del Collaboration Group
2024-01-01

Abstract

To maintain the carbon dioxide concentration below the no-return threshold for climate change, we must consider the reduction in anthropic emissions coupled to carbon capture methods applied in synergy. In our recent papers, we proposed a green and reliable method for carbon mineralization using ascorbic acid aqueous solution as the reducing agent for carbon (IV) to carbon (III), thus obtaining oxalic acid exploiting green reagents. Oxalic acid is made to mineralize as calcium (as the model cation) oxalate. Oxalates are solid-state reservoirs suitable for long-term carbon storage or carbon feedstock for manufacturing applications. The carbon mineralization reaction is a double-step process (carbon reduction and oxalate precipitation), and the carbon capture efficiency is invariably represented by a double-slope curve we formerly explained as a decrease in the reducing effectiveness of ascorbic acid during reaction. In the present paper, we demonstrated that the reaction proceeds via a “pure CO2-capture” stage in which ascorbic acid oxidizes into dehydroascorbic acid and carbon (IV) reduces to carbon (III) and a “mixed” stage in which the redox reaction competes with the degradation of ascorbic acid in producing oxalic acid. Despite the irreversibility of the reduction reaction, that was demonstrated in abiotic conditions, the analysis of costs according to the market price of the reagents endorses the application of the method.
2024
Inglese
Esperti anonimi
6
4
1389
1406
18
https://www.mdpi.com/2571-8797/6/4/66
carbon mineralization, carbon capture, metal oxalate, ascorbic acid, carbon isotopes
no
   PAVESE Alessandro - MIUR - PRIN 2017 Linea a - MINERAL REACTIVITY, A KEY TO UNDERSTAND LARGE-SCALE PROCESSES: FROM ROCK FORMING ENVIRONMENTS TO SOLID WASTE RECOVERING/LITHIFICATION
   ----
   MINISTERO DELL'UNIVERSITA' E DELLA RICERCA
   PRIN 2017

   CLEAN - Ceneri Leggere Eco-sostenibili per un Ambiente No-rifiuti - Bando per il cofinanziamento di progetti di ricerca Ediz. 2020- Direzione Economia Circolare -Ministero Transizione Ecologica (ex Ambiente)- CDD 22-02-2022
   CLEAN
   MINISTERO DELL'AMBIENTE E DELLA TUTELA DEL TERRITORIO E DEL MARE
   Pavese A. -
1 – prodotto con file in versione Open Access (allegherò il file al passo 6 - Carica)
262
7
Pastero, Linda; Barella, Vittorio; Allais, Enrico; Pazzi, Marco; Sordello, Fabrizio; Wehrung, Quentin; Pavese, Alessandro
info:eu-repo/semantics/article
open
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/2029351
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