Preparação de soluções sólidas superficiais à base de alumina como catalisadores para síntese do biodiesel via rota etílica

Detalhes bibliográficos
Ano de defesa: 2014
Autor(a) principal: Besse, Manoela Romero [UNESP]
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Estadual Paulista (Unesp)
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11449/110688
Resumo: The demand for alternative fuels has become very attractive compared to diesel due to its environmental benefits. Following this trend, biodiesel, a form of biodegradable and renewable energy can be produced by a transesterification reaction from esters of long chain fatty acids derived from renewable lipids such as vegetable oil with long chains. However, to this reaction occurs with a good yield id required the use of catalysts, that may be of differently types. In this context, this work involves the preparation and structural characterization of a catalyst (catalytic converter), alumina-based synthesis of Biodiesel via ethyl route. Alumina has a low cost and has been studied as a promising potential in catalytic synthesis of biodiesel. From the host structure of Al2O3, synthesized by modified Polyol Method, were investigated solid solution of Al2O3:Eu3+ with percentages by mass of the europium(III) ion 0.025%, 0.050 % and 0.075%, also prepared by chemical synthesis, using the same method. The thermal decomposition of the precursor powders of Al2O3 and Al2O3:Eu3+ were characterized by thermal analysis (TG/DSC), and it was not observed a large loss of mass in the doped systems. The structural characterized of the powders were by scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared and Raman spectroscopy. The XRD results for the Al2O3:Eu3+ showed crystalline systems after pre-calcination and IR analysis showed bands below 407 cm-1, related to the vibrations of Eu-O, indicating the presence of ions europium(III) in the crystal lattice. The structural parameters were determined from Rietveld structural refinement of the XRD using the program FullProf. Analyses of refinement showed that the precursor powder of Al2O3:Eu3+with 0.025 wt% of europium(III) ions behaved differently compared to other powders doped , this being the only one to have shown catalytic activity in the transesterification reaction of oil soybeans for ...