Investigation of the pore blockage of a Brazilian dolomite during the sulfation reaction

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dc.contributor.authorAvila, Ivonete
dc.contributor.authorCrnkovic, Paula M. [UNESP]
dc.contributor.authorMilioli, Fernando E.
dc.contributor.authorLuo, Kai H.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniv Southampton
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:33:09Z
dc.date.available2014-05-20T15:33:09Z
dc.date.issued2012-02-01
dc.description.abstractThe influence of the temperature and reaction time on the sulfation process of a dolomite is investigated in this paper. The sulfation effectiveness was evaluated and correlated with changes in the physical characteristics of a Brazilian dolomite during the reactive process. Calcination and sulfation experiments were performed under isothermal conditions for dolomite samples with average particle sizes of 545 mu m at temperatures of 750 degrees C, 850 degrees C and 950 degrees C at different times of sulfation. Thermogravimetric tests were applied to establish the reactivity variation of the dolomite in function of the time in the sulfation reaction and evaluate the methodology of the samples preparation. Porosimetry tests were performed to study the pore blockage of dolomite during the sulfation reaction. The highest values of BET surface area were 25.55 m(2)/g, 29.55 m(2)/g and 12.62 m(2)/g for calcined samples and after their sulfation processes, conversions of 51.5%, 61.9% and 42.8% were obtained at 750 degrees C, 850 degrees C and 950 degrees C, respectively. Considering the process as a whole, the best fit was provided by a first-order exponential decay equation. Moreover, the results have shown that it is possible to quantify the decreasing in the dolomite reactivity for sulfur dioxide sorption and understand the changes in the behavior of the sulfation process of limestones when applied to technologies, as fluidized bed combustor, in which sulfur dioxide is present. (C) 2011 Elsevier B. V. All rights reserved.en
dc.description.affiliationUniv São Paulo, Grp Thermal & Fluids Engn, Sch Engn São Carlos, BR-13566590 São Carlos, SP, Brazil
dc.description.affiliationUniv Southampton, Energy Technol Res Grp, Sch Engn Sci, Southampton SO17 1BJ, Hants, England
dc.description.affiliationSão Paulo State Univ, Inst Chem, BR-14800900 Araraquara, Brazil
dc.description.affiliationUnespSão Paulo State Univ, Inst Chem, BR-14800900 Araraquara, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipIdFAPESP: 08/54062-9
dc.description.sponsorshipIdFAPESP: 11/11321-7
dc.description.sponsorshipIdCAPES: PNPD 0034088
dc.description.sponsorshipIdCAPES: BEX 1149/10-5
dc.format.extent3532-3539
dc.identifierhttp://dx.doi.org/10.1016/j.apsusc.2011.11.108
dc.identifier.citationApplied Surface Science. Amsterdam: Elsevier B.V., v. 258, n. 8, p. 3532-3539, 2012.
dc.identifier.doi10.1016/j.apsusc.2011.11.108
dc.identifier.issn0169-4332
dc.identifier.urihttp://hdl.handle.net/11449/41858
dc.identifier.wosWOS:000300185800032
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofApplied Surface Science
dc.relation.ispartofjcr4.439
dc.relation.ispartofsjr1,093
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectPore blockageen
dc.subjectDolomiteen
dc.subjectSulfationen
dc.subjectThermal decompositionen
dc.subjectBET surface areaen
dc.titleInvestigation of the pore blockage of a Brazilian dolomite during the sulfation reactionen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.

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