Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids

Detalhes bibliográficos
Autor(a) principal: Morin, P.
Data de Publicação: 2007
Outros Autores: Hamad, B., Sapaly, G., Rocha, M. G. Carneiro, Oliveira, P. G. Pries de, Gonzalez, W. A., Sales, E. Andrade, Essayem, Nadine
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://repositorio.ufba.br/ri/handle/ri/14348
Resumo: Texto completo: acesso restrito. p. 69-76
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spelling Morin, P.Hamad, B.Sapaly, G.Rocha, M. G. CarneiroOliveira, P. G. Pries deGonzalez, W. A.Sales, E. AndradeEssayem, NadineMorin, P.Hamad, B.Sapaly, G.Rocha, M. G. CarneiroOliveira, P. G. Pries deGonzalez, W. A.Sales, E. AndradeEssayem, Nadine2014-01-14T11:19:49Z20070926-860Xhttp://repositorio.ufba.br/ri/handle/ri/14348v. 330, n. 1-2Texto completo: acesso restrito. p. 69-76Heteropolyacids (HPA) with Keggin structure were evaluated as homogeneous Br∅nsted acid catalysts in the reaction of rapeseed oil transesterification with methanol and ethanol at 358 K and atmospheric pressure. Rapeseed oil transesterification with ethanol over anhydrous Keggin HPAs leads to higher conversion level than H2SO4 compared at equivalent H+ concentration and H2O/H+ molar ratio. By contrast, Phosphoric acid, a quite weaker mineral acid, structurally close to H3PW12O40, is not operative under similar conditions. This demonstrates the advantages of strong Br∅nsted acids in vegetable oil transesterification with ethanol in mild conditions. It is worth noticing that differences in acid strength between anhydrous Keggin heteropolyacids, H3PW12O40, H4SiW12O40, H3PMo12O40, H4SiMo12O40, measured by calorimetry, did not correlate simply the catalytic activity. Indeed, the proton solvation with water molecule was shown to be a crucial parameter. Then, Mo samples exhibited higher activities due to their ability to lose crystallization water at lower temperatures compared to W samples. Finally, it was shown that higher transesterification rates were obtained with ethanol than methanol in presence of HPA.Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2014-01-14T11:19:49Z No. of bitstreams: 1 1-s2.0-S0926860X07004292-main.pdf: 517530 bytes, checksum: 5bbe4398ded28ab596d16105dd10ee44 (MD5)Made available in DSpace on 2014-01-14T11:19:49Z (GMT). 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dc.title.pt_BR.fl_str_mv Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
dc.title.alternative.pt_BR.fl_str_mv Applied Catalysis A: General
title Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
spellingShingle Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
Morin, P.
Biodiesel
Transesterification
Rapeseed oil
Vegetable oil
Heteropolyacids
title_short Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
title_full Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
title_fullStr Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
title_full_unstemmed Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
title_sort Transesterification of rapeseed oil with ethanol: I. catalysis with homogeneous Keggin heteropolyacids
author Morin, P.
author_facet Morin, P.
Hamad, B.
Sapaly, G.
Rocha, M. G. Carneiro
Oliveira, P. G. Pries de
Gonzalez, W. A.
Sales, E. Andrade
Essayem, Nadine
author_role author
author2 Hamad, B.
Sapaly, G.
Rocha, M. G. Carneiro
Oliveira, P. G. Pries de
Gonzalez, W. A.
Sales, E. Andrade
Essayem, Nadine
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Morin, P.
Hamad, B.
Sapaly, G.
Rocha, M. G. Carneiro
Oliveira, P. G. Pries de
Gonzalez, W. A.
Sales, E. Andrade
Essayem, Nadine
Morin, P.
Hamad, B.
Sapaly, G.
Rocha, M. G. Carneiro
Oliveira, P. G. Pries de
Gonzalez, W. A.
Sales, E. Andrade
Essayem, Nadine
dc.subject.por.fl_str_mv Biodiesel
Transesterification
Rapeseed oil
Vegetable oil
Heteropolyacids
topic Biodiesel
Transesterification
Rapeseed oil
Vegetable oil
Heteropolyacids
description Texto completo: acesso restrito. p. 69-76
publishDate 2007
dc.date.issued.fl_str_mv 2007
dc.date.accessioned.fl_str_mv 2014-01-14T11:19:49Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
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dc.identifier.uri.fl_str_mv http://repositorio.ufba.br/ri/handle/ri/14348
dc.identifier.issn.none.fl_str_mv 0926-860X
dc.identifier.number.pt_BR.fl_str_mv v. 330, n. 1-2
identifier_str_mv 0926-860X
v. 330, n. 1-2
url http://repositorio.ufba.br/ri/handle/ri/14348
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.pt_BR.fl_str_mv http://dx.doi.org/10.1016/j.apcata.2007.07.011
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