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Reaction Mechanism for the Aqueous-Phase Mineral Carbonation of Heat-Activated Serpentine at Low Temperatures and Pressures in Flue Gas Conditions.

Pasquier, Louis-César; Mercier, Guy; Blais, Jean-François; Cecchi, Emmanuelle; Kentish, Sandra (2014). Reaction Mechanism for the Aqueous-Phase Mineral Carbonation of Heat-Activated Serpentine at Low Temperatures and Pressures in Flue Gas Conditions. Environmental Science & Technology , vol. 48 , nº 9. p. 5163-5170. DOI: 10.1021/es405449v.

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Résumé

Mineral carbonation is known as one of the safest ways to sequester CO₂. Nevertheless, the slow kinetics and low carbonation rates constitute a major barrier for any possible industrial application. To date, no studies have focused on reacting serpentinite with a relatively low partial pressure of CO₂ (pCO₂) close to flue gas conditions. In this work, finely ground and heat-treated serpentinite [Mg₃Si₂O₅(OH)₄] extracted from mining residues was reacted with a 18.2 vol % CO₂ gas stream at moderate global pressures to investigate the effect on CO₂ solubility and Mg leaching. Serpentinite dissolution rates were also measured to define the rate-limiting step. Successive batches of gas were contacted with the same serpentinite to identify surface-limiting factors using scanning electron microscopy (SEM) analysis. Investigation of the serpentinite carbonation reaction mechanisms under conditions close to a direct flue gas treatment showed that increased dissolution rates could be achieved relative to prior work, with an average Mg dissolution rate of 3.55 x 10⁻¹¹ mol cm⁻² s⁻¹. This study provides another perspective of the feasibility of applying a mineral carbonation process to reduce industrial greenhouse gas (GHG) emissions from large emission sources.

Type de document: Article
Mots-clés libres: dissolution; flue gases; greenhouse gases; industrial applications; industrial emissions; reaction rates; scanning electron microscopy; serpentine
Centre: Centre Eau Terre Environnement
Date de dépôt: 18 avr. 2018 14:07
Dernière modification: 18 avr. 2018 14:07
URI: http://espace.inrs.ca/id/eprint/3780

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