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Thermal decomposition of dolomite under CO2: insights from TGA and in situ XRD analysis

 

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dc.creator Valverde Millán, José Manuel es
dc.creator Parejón Pazo, Antonio es
dc.creator Medina Carrasco, Santiago es
dc.creator Pérez Maqueda, Luis Allan es
dc.date.accessioned 2018-04-10T10:28:53Z
dc.date.available 2018-04-10T10:28:53Z
dc.date.issued 2015
dc.identifier.citation Valverde Millán, J.M., Parejón Pazo, A., Medina Carrasco, S. y Pérez Maqueda, L.A. (2015). Thermal decomposition of dolomite under CO2: insights from TGA and in situ XRD analysis. Physical Chemistry Chemical Physics, 17, 30162-30176.
dc.identifier.issn 1463-9076 es
dc.identifier.uri https://hdl.handle.net/11441/72281
dc.description.abstract Thermal decomposition of dolomite in the presence of CO2 in a calcination environment is investigated by means of in situ X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The in situ XRD results suggest that dolomite decomposes directly at a temperature around 700 °C into MgO and CaO. Immediate carbonation of nascent CaO crystals leads to the formation of calcite as an intermediate product of decomposition. Subsequently, decarbonation of this poorly crystalline calcite occurs when the reaction is thermodynamically favorable and sufficiently fast at a temperature depending on the CO2 partial pressure in the calcination atmosphere. Decarbonation of this dolomitic calcite occurs at a lower temperature than limestone decarbonation due to the relatively low crystallinity of the former. Full decomposition of dolomite leads also to a relatively low crystalline CaO, which exhibits a high reactivity as compared to limestone derived CaO. Under CO2 capture conditions in the Calcium-Looping (CaL) process, MgO grains remain inert yet favor the carbonation reactivity of dolomitic CaO especially in the solid-state diffusion controlled phase. The fundamental mechanism that drives the crystallographic transformation of dolomite in the presence of CO2 is thus responsible for its fast calcination kinetics and the high carbonation reactivity of dolomitic CaO, which makes natural dolomite a potentially advantageous alternative to limestone for CO2 capture in the CaL technology as well as SO2in situ removal in oxy-combustion fluidized bed reactors. es
dc.description.sponsorship España Mineco CTQ2014-52763-C2-1-R CTQ2014-52763-C2-2-R es
dc.description.sponsorship Junta de Andalucia FQM-5735 es
dc.format application/pdf es
dc.language.iso eng es
dc.publisher Royal Society of Chemistry es
dc.relation.ispartof Physical Chemistry Chemical Physics, 17, 30162-30176.
dc.rights Attribution-NonCommercial-NoDerivatives 4.0 Internacional *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/4.0/ *
dc.title Thermal decomposition of dolomite under CO2: insights from TGA and in situ XRD analysis es
dc.type info:eu-repo/semantics/article es
dc.type.version info:eu-repo/semantics/submittedVersion es
dc.rights.accessrights info:eu-repo/semantics/openAccess es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Química Inorgánica es
dc.contributor.affiliation Universidad de Sevilla. Departamento de Electrónica y Eloctromagnetismo es
dc.relation.projectID FQM-5735 es
dc.relation.projectID CTQ2014-52763-C2-1-R es
dc.relation.projectID CTQ2014-52763-C2-2-R es
dc.relation.publisherversion http://dx.doi.org/10.1039/C5CP05596B es
dc.identifier.doi 10.1039/C5CP05596B es
idus.format.extent 36 p. es
dc.journaltitle Physical Chemistry Chemical Physics es
dc.publication.volumen 17 es
dc.publication.initialPage 30162 es
dc.publication.endPage 30176 es
dc.contributor.funder Ministerio de Economía y Competitividad (MINECO). España
dc.contributor.funder Junta de Andalucía
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