Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.21/7150 |
Resumo: | Lime 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. |
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Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reactionBiodiesellimeCalcium hydroxideCalcium methoxideCalcium diglyceroxideActive phaseLime 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.ElsevierRCIPLSoares Dias, Ana PaulaPuna, JaimeGomes, JoãoMaria Joana, Neiva CorreiaBordado, João2017-06-05T15:58:23Z2016-072016-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/7150engSOARES 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. 622-6300960-148110.1016/j.renene.2016.07.033metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T09:52:51Zoai:repositorio.ipl.pt:10400.21/7150Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:16:09.564879Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
title |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
spellingShingle |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction Soares Dias, Ana Paula Biodiesel lime Calcium hydroxide Calcium methoxide Calcium diglyceroxide Active phase |
title_short |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
title_full |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
title_fullStr |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
title_full_unstemmed |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
title_sort |
Biodiesel production over lime. Catalytic contributions of bulk phases and surface Ca species formed during reaction |
author |
Soares Dias, Ana Paula |
author_facet |
Soares Dias, Ana Paula Puna, Jaime Gomes, João Maria Joana, Neiva Correia Bordado, João |
author_role |
author |
author2 |
Puna, Jaime Gomes, João Maria Joana, Neiva Correia Bordado, João |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Soares Dias, Ana Paula Puna, Jaime Gomes, João Maria Joana, Neiva Correia Bordado, João |
dc.subject.por.fl_str_mv |
Biodiesel lime Calcium hydroxide Calcium methoxide Calcium diglyceroxide Active phase |
topic |
Biodiesel lime Calcium hydroxide Calcium methoxide Calcium diglyceroxide Active phase |
description |
Lime 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. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-07 2016-07-01T00:00:00Z 2017-06-05T15:58:23Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.21/7150 |
url |
http://hdl.handle.net/10400.21/7150 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
SOARES 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. 622-630 0960-1481 10.1016/j.renene.2016.07.033 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799133421110296576 |