Preparação e caracterização do catalisador óxido misto de cobre-zinco-alumínio, obtido via complexação (processo citrato), para a transformação do etanol a acetato de etila

• Ano de defesa: 1991
• Autor(a) principal: Reis, Rubem da Cunha
• Orientador(a): Bueno, José Maria Corrêa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos; Câmpus São Carlos
• Programa de Pós-Graduação: Programa de Pós-Graduação em Engenharia Química - PPGEQ
• Palavras-chave em Português: Complexação; Óxido misto; Esterificação direta; Etanol; Catálise heterogênea
• Palavras-chave em Inglês: Complexation; Mixed oxide; Direct esterification; Ethanol; Catalysis heterogeneous
• Área do conhecimento CNPq: ENGENHARIAS::ENGENHARIA QUIMICA
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/13208

Cu-Zn-Al mixture oxides catalysts with atomic ratios r-Cu/Zn=3,0 and R=Cu+Zn/Al=1,2 were obtained by means of citric complexing method. The influence of citric acid content was studied varying P=(eq.citric acid/Eq.metal) between 0,7-1,5 and the calcination temperature from 400 to 700°C in the precursors. Precursors and oxides were characterized by IR, TDA, TGA, XRD, SBET, TPR, SCU and SEM. The thermal decomposition of the precursors was studied in N2 and air atmosphere. The X-rays diphratograms of the calcinated oxides presented two cristallite phases: CuO and ZnAl2 04. The TPR curves showed an increment of CuO phase segregation as the calcination temperature was increased. The catalytic activity of this system was checked through the direct transformation of ethanol varying contact tim e and reaction temperature. It was verified that the catalysts presented decreasing activity for ethyl acetate when Cuo segregation increased.