New heterogeneous catalyst for the esterification of fatty acid produced by surface aromatization/sulfonation of oilseed cake.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorSantos, Eleonice Moreira-
Autor(es): dc.creatorTeixeira, Ana Paula de Carvalho-
Autor(es): dc.creatorSilva, Flávia Gontijo da-
Autor(es): dc.creatorCibaka, Thérèse Ebambi-
Autor(es): dc.creatorAraújo, Maria Helena-
Autor(es): dc.creatorOliveira, Willian Xerxes Coelho-
Autor(es): dc.creatorMedeiros, Felipe-
Autor(es): dc.creatorBrasil, Alex Nogueira-
Autor(es): dc.creatorOliveira, Leandro Soares de-
Autor(es): dc.creatorLago, Rochel Montero-
Data de aceite: dc.date.accessioned2025-08-21T16:00:57Z-
Data de disponibilização: dc.date.available2025-08-21T16:00:57Z-
Data de envio: dc.date.issued2016-10-03-
Data de envio: dc.date.issued2016-10-03-
Data de envio: dc.date.issued2015-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/7006-
Fonte completa do material: dc.identifierhttps://doi.org/10.1016/j.fuel.2015.02.027-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1030034-
Descrição: dc.descriptionIn this work, an efficient heterogeneous acid catalyst for the esterification of oleic acid was prepared directly from oilseed cake by a simple sulfonation with concentrated H2SO4. Characterization by SEM/EDS, IR, Raman, TG, TG/MS, potentiometric titration showed that treatment with H2SO4 for 1, 2 and 4 h at 120 _C partially dehydrates the cake to form a carbon/cellulose composite which is sulfonated to produce strong ASO3H acidic sites. These surface sites were active for the esterification of oleic acid with yields ca. 84%, 88% and 94% in the presence of 5, 10 and 20 wt% catalyst, respectively. These results are comparable to 98% yield obtained with 1 wt% H2SO4 and higher than 75% observed for a high surface area (880 m2 g_1) sulfonated activated carbon with similar number of ASO3H active groups. These results are discussed in terms of two effects: (i) the number of sulfonic surface acidic groups and (ii) the presence of a hydrophilic cellulosic fraction in the catalyst that adsorbs/traps water formed in the reaction shifting the esterification equilibrium and improving the yield.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsaberto-
Direitos: dc.rightsO periódico Fuel concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3957611079029.-
Palavras-chave: dc.subjectAcid catalyst-
Palavras-chave: dc.subjectOleic acid-
Palavras-chave: dc.subjectEsterification-
Palavras-chave: dc.subjectBiodiesel cake-
Palavras-chave: dc.subjectAromatization-
Título: dc.titleNew heterogeneous catalyst for the esterification of fatty acid produced by surface aromatization/sulfonation of oilseed cake.-
Aparece nas coleções:Repositório Institucional - UFOP

Não existem arquivos associados a este item.