Produção de biodiesel por meio da transesterificação seguido de esterificação do óleo resídual de frituras utilizando MoO3/Al2O3 como catalisador.

Abstract

The disordered use of fossil fuels results in environmental impacts, a factor that enhances further the development of renewable energy. An excellent alternative fuel, because degrades less the environment bringing benefit to society, in addition to meet the country's energetic demand, is the biodiesel. The study aimed to the preparation of heterogeneous catalysts based on alumina by combustion reaction and by means of impregnation with molybdenum trioxide, wet method for the production of biodiesel from waste oil frying, through the transesterification reaction. The catalysts were characterized by X-ray diffraction (XRD), particle size distribution, textural analysis by nitrogen adsorption (BET), chemical analysis by fluorescence X-ray energy dispersive (EDX) and catalytic tests. The results showed the presence of the stable crystalline phase after impregnation Al2O3 and the second layer formed of MoO3. The samples had surface area of average values for alumina (Al2O3) 5.07 m2.g-1 and the catalyst Al2O3 / MoO3 5.27 m2.g-1 with pore rating in the mesoporous range. The catalytic tests were done in reaction times of 1, 2 and 3 hours after impregnation, it revealed an excellent and promising catalytic potential for all time points, with percentages of conversion between 80-94% in methyl esters (biodiesel).