"Oxidação do cicloexeno a cicloexanona pelo Processo Wacker"

AUTOR(ES)

Marisa Simone Melgo

DATA DE PUBLICAÇÃO

2004

RESUMO

Cyclohexanone is an important industrial intermediate which is normally obtained together with cyclohexanol by cyclohexane oxidation using homogeneous cobalt catalysts. The conversion is limited to 4% in order to keep the selectivity high. In this work, we studied the synthesis of cyclohexanone by Wacker oxidation of cyclohexene using the chloride ion- free catalytic system Pd(NO3)2/CuSO4/H3PMo12O40. The system was investigated at different air pressures, temperatures, solvents and catalyst concentrations. The results show that this system is very efficient and highly selective. After 1 h of reaction at 80 °C and an air pressure of 50 bar, a conversion of 80% and a selectivity of more than 99% for cyclohexanone was obtained. Using aqueous hydrogen peroxide and no external pressure, the oxidation was more rapid, giving 80% conversion already after 30 min and 95% conversion after 60 min without the formation of any byproducts. Other Keggin heteropolyacids were studied as reoxidants of the system, but they did not show to be efficient as the H3PMo12O40.

ASSUNTO(S)

paladio catalise acidos

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