Determination of the activation energies of beef tallow and crude glycerin combustion using thermogravimetry

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dc.contributor.authorCrnkovic, Paula Manoel [UNESP]
dc.contributor.authorKoch, Christoph
dc.contributor.authorAvila, Ivonete
dc.contributor.authorMortari, Daniela Andresa
dc.contributor.authorCordoba, Aymer Maturana
dc.contributor.authordos Santos, Antonio Moreira
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionLeibniz Univ Hannover
dc.date.accessioned2014-05-20T15:31:58Z
dc.date.available2014-05-20T15:31:58Z
dc.date.issued2012-09-01
dc.description.abstractThe present study deals with the determination of the activation energy for the thermal decomposition of two renewable fuels crude glycerin and beef tallow. The activation energies were investigated by using a thermogravimetric analyzer (TGA) in the temperature range of 25-600 degrees C in atmosphere of synthetic air. The TG curves of the thermal decomposition process of both samples were divided into several phases and the second, called PH2, was chosen for the kinetic study because it is associated with the combustion ignition. Differential Thermal Analysis (DTA) showed an endothermic event at the PH2 region for the crude glycerin corresponding to devolatilization, while for beef tallow, this step presented an exothermic event, called LTO (low-temperature oxidation), which is correlated with devolatilization followed by combustion. For the entire PH2, activation energy values for crude glycerin were between 90 kJ mol(-1) and 42 kJ mol(-1), while for the beef tallow they ranged from 50 kJ mol(-1) to 113 kJ mol (1). The activation energy values obtained at the pre-ignition stage - conversion between 0 and 0.45 - showed that the crude glycerin with higher values requires an additional energetic support at the start of combustion processes and the beef tallow ignites more easily, presenting lower values. According to the Wolfer's equation, a direct relation between the activation energy and the ignition delay is established and the results of this study provides useful data for the development and design of new combustion chambers and engines when non-traditional fuels are used as feedstock. (C) 2012 Elsevier Ltd. All rights reserved.en
dc.description.affiliationPaulista State Univ Unesp, Inst Chem, Araraquara, Brazil
dc.description.affiliationUniv São Paulo, São Carlos, SP, Brazil
dc.description.affiliationLeibniz Univ Hannover, Hannover, Germany
dc.description.affiliationUnespPaulista State Univ Unesp, Inst Chem, Araraquara, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdCAPES: 0034088
dc.description.sponsorshipIdCAPES:1149/10-5
dc.description.sponsorshipIdFAPESP: 11/00183-2
dc.description.sponsorshipIdFAPESP: 11/11321-7
dc.identifierhttp://dx.doi.org/10.1016/j.biombioe.2012.04.013
dc.identifier.citationBiomass & Bioenergy. Oxford: Pergamon-Elsevier B.V. Ltd, v. 44, p. 8-16, 2012.
dc.identifier.doi10.1016/j.biombioe.2012.04.013
dc.identifier.issn0961-9534
dc.identifier.urihttp://hdl.handle.net/11449/40986
dc.identifier.wosWOS:000307031900002
dc.language.isoeng
dc.publisherPergamon-Elsevier B.V. Ltd
dc.relation.ispartofBiomass & Bioenergy
dc.relation.ispartofjcr3.358
dc.relation.ispartofsjr1,235
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectBiofuelsen
dc.subjectCrude glycerinen
dc.subjectBeef tallowen
dc.subjectKineticsen
dc.subjectThermal analysisen
dc.subjectIgnition delayen
dc.titleDetermination of the activation energies of beef tallow and crude glycerin combustion using thermogravimetryen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderPergamon-Elsevier B.V. Ltd

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