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Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction

2016-07Journal article Restricted access
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dc.contributor.authorSoares Dias, Ana Paula
dc.contributor.authorPuna, Jaime
dc.contributor.authorGomes, João
dc.contributor.authorMaria Joana, Neiva Correia
dc.contributor.authorBordado, João
dc.date.accessioned2017-06-05T15:58:23Z
dc.date.available2017-06-05T15:58:23Z
dc.date.issued2016-07
dc.description.abstractLime is pointed out as an effective catalyst for biodiesel production by oil methanolysis. Several Ca phases are formed during reaction. Each Ca phase has different contribution to the catalyzed process. Using CaO as a catalyst, S shape kinetics curve was observed and the induction period can be ascribed to the Ca(OH)(2) formation. When Ca(OH)(2), prepared by contacting CaO with H2O, is used as catalyst the initial period with a slow rate of transesterification has almost vanished. Besides, if the catalyst surface is totally converted into methoxide species the induction period is longer than the analogous obtained with CaO. This is an indication that the methoxide species strongly bonded to Ca are less reactive. The calcium diglyceroxide material (CaO_diglyc), prepared by contacting CaO with a mixture of methanol and glycerol, displays a totally different kinetics curve with no induction period. The faster kinetics and the Ca species detected in the glycerin phase seem to underline a non-negligible homogeneous process contribution. The characterization of the post-reaction catalysts underlines the relevance of the surface and bulk catalyst modifications. Calcium hydroxide can be pointed out as the active phase whereas calcium diglyceroxide is responsible for the catalyst deactivation due to calcium leaching.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationSOARES DIAS, Ana Paula [et al] – Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction. Renewable Energy. ISSN: 0960-1481. Vol. 99, (2016), pp. 622-630pt_PT
dc.identifier.doi10.1016/j.renene.2016.07.033pt_PT
dc.identifier.issn0960-1481
dc.identifier.urihttp://hdl.handle.net/10400.21/7150
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttp://ac.els-cdn.com/S0960148116306292/1-s2.0-S0960148116306292-main.pdf?_tid=0f2cba72-4479-11e7-9cd9-00000aacb35f&acdnat=1496067419_21f09fd1eda61e2409770b8105e1606apt_PT
dc.subjectBiodieselpt_PT
dc.subjectlimept_PT
dc.subjectCalcium hydroxidept_PT
dc.subjectCalcium methoxidept_PT
dc.subjectCalcium diglyceroxidept_PT
dc.subjectActive phasept_PT
dc.titleBiodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reactionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage630pt_PT
oaire.citation.startPage622pt_PT
oaire.citation.titleRenewable Energypt_PT
oaire.citation.volume99pt_PT
person.familyNamePuna
person.familyNameGomes
person.familyNameBordado
person.givenNameJaime
person.givenNameJoão
person.givenNameJoão
person.identifier790253
person.identifier60203
person.identifier.ciencia-idEE14-5CB2-AF04
person.identifier.ciencia-id0212-E6D6-566C
person.identifier.ciencia-id5A1C-D29F-324A
person.identifier.orcid0000-0002-2763-3655
person.identifier.orcid0000-0003-2579-6669
person.identifier.orcid0000-0002-9832-6433
person.identifier.ridA-6442-2011
person.identifier.ridM-1952-2014
person.identifier.scopus-author-id24402152700
person.identifier.scopus-author-id56113031900
person.identifier.scopus-author-id6603731772
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationcc1ba86f-9699-4622-a467-dece54231697
relation.isAuthorOfPublicatione44cd72e-bcbb-4612-a274-60cb1915bc0c
relation.isAuthorOfPublicatione0b6d47e-98c2-47c2-a48c-45041d3fb841
relation.isAuthorOfPublication.latestForDiscoverycc1ba86f-9699-4622-a467-dece54231697

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