Desenvolvimento de catalisadores com estrutura perovsquita do tipo La1-xSrxNiO3 pelo método do gel proteico modificado com soja e colágeno

• Ano de defesa: 2013
• Autor(a) principal: Moraes Júnior, Eugênio Oliveira
• Orientador(a): Souza, Anne Michelle Garrido Pedrosa de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Programa de Pós-Graduação: Pós-Graduação em Química
• Palavras-chave em Português: Catalisadores; Oxidação; Perovsquita; Colágeno; Difratometria de raios X; Fibras vegetais
• Palavras-chave em Inglês: Catalysts; Oxidation; Perovskite
• Área do conhecimento CNPq: CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: https://ri.ufs.br/handle/riufs/6089

In this work, the perovskite oxides La1-xSrxNiO3 (x = 0,0, 0,3 e 0,7) partially replacing lanthanum by strontium were prepared by the method of protein gel, modified using collagen and soy as chelating agents. All samples were synthesized and calcined at 900°C for 2 hours and characterized by thermogravimetric techniques (TG), spectroscopy of absorption in the infrared region (FTIR), X-ray diffraction (DRX), specific surface area and temperature programmed reduction. The calcined samples were supported on alumina. The FTIR spectra showed bands related to the complexation of the metals to the oxygen. The thermogravimetric curves indicated thermal stability of materials at 900°C, except, the La0,3Sr0,7NiO3 samples that showed a decomposition about 800°C. The X-ray diffraction results indicated the formation of the perovskite phase in all samples, but there was the formation of secondary phases in all samples replaced. The samples that presented less formation of secondary phases were obtained using the collagen as a chelating agent. The supported material presented peaks related to the perovskite phase. The specific surface areas of the catalysts increased when supported on alumina. The complete reduction of the supported samples, obtained by the method of protein gel using the collagen occurred at temperatures below 700°C. The obtained samples using collagen as a chelating agent and supported with 15% of perovskite were tested by the reaction of partial oxidation of methane, when also were analysed methane conversion level and selectivity to CO, CO2, H2 and H2O. Among the catalysts studied, the catalyst LN9-C15 showed the highest level of methane conversion, 78%, and the better selectivity to H2, 55%.