Abstract
Cerium catalysts supported by zeolites and kieselguhr were used in this work to catalyze the liquid—phase oxidation of cyclohexanone to produce dibasic acids and caprolactone with glacial acetic acid as the solvent and oxygen gas as the oxidant at 98–118°C and 5–15 kg/cm2.The results revealed that the activity of the cerium catalyst supported by zeolite X (CeX) was higher than that of the cerium oxide catalyst and was far higher than those supported by zeolite Y and kisselguhr. When the cerium content in CeX catalyst was larger than 2.77 meq/g, the conversation could be up to 70% within three hours, at 108°C and 15 kg/cm2. The fractional yield of dibasic acids (adipic acid and glutanic acid) were about 0.8–0.9 and were higher than those obtained in the previous studies with cobalt acetate, Co—type weak acid resin and cerium oxide as the catalysts.
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