Caracterização de catalisadores usados na oleoquímica

AUTOR(ES)

Mírian da Silva Costa Pereira

DATA DE PUBLICAÇÃO

2010

RESUMO

In order to improve the physical-chemical properties of bio oil from castor oil were used as catalysts silica and alumina, both pure and doped. The study showed that products from the catalytic cracking of castor oil have properties more satisfactory, especially when using alumina. This fact can be explained by higher acidity, mesoporous characteristic and smaller surface area of pure and doped alumina. Subsequently, in this work, we studied the catalytic activity of commercial alumina and doped with Lewis acid metals, in the epoxidation of methyl oleate with aqueous hydrogen peroxide. It was observed that the reaction yields increased when the amount of catalyst, the quantity of hydrogen peroxide, the concentration of the hydrogen peroxide solution, or the surface area of the catalyst was increased. Reaction yields decreased when the surface acidity of the alumina was modified by doping with Lewis acid metals. Finally, we studied the catalytic activity of natural and acid-activated clays in esterification reactions of different carboxylic acids with various alcohols. The activated clays were more active. The VLa clay showed higher catalytic activity than the BBa and this result is probably related to the larger surface area and higher pore volume of the VLa, which facilitates the diffusion process. The only exception was for the phenylacetic acid because both catalysts (BBa and VLa) promoted the same conversion (90%).

ASSUNTO(S)

aluminas fisico-quimica catalysts, alumina, silica, clay, oleochemical catalisadores sílicas argilas oleoquímica

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