US EPA

5340001 

Journal Article 

Oxidation of octadecanol to octadecanoic acid over Cr2O3-Co3O4/SiO2 catalyst 

Zhuang, H; Bi, YL; Cheng, TX; Liu, Y; Zhou, GD; Li, WX; Zhen, KJ 

2003 

1 

Cuihua Xuebao / Chinese Journal of Catalysis
ISSN: 0253-9837 

24 

2 

115-118 

WOS:000181567900010 

A series of Cr2O3-Co3O4/SiO2 catalyst with different Cr/Co ratios was prepared by impregnation method. The catalyst samples were charaterized by XRD, FT-IR and BET techniques. The characteristic peaks of Cr2O3 and Co3O4 can be observed in both XRD patterns and FT-IR spectra. The specific surface area, the pore volume and the pore diameter of Cr2O3-Co3O4/SiO2 catalyst become smaller owing to the metal oxides loaded on the inner surface of silica. It is reported that the effects of reaction conditions on catalytic performance of Cr2O3-Co3O4/SiO2 for the oxidation of octadecanol to octadecanoic acid are based on the high conversion of ocadecanol over Cr2O3/SiO2 catalyst and the high selectivity for octadecanoic acid over Co3O4/SiO2 catalyst. The yield of octadecanoic acid tended to rise with the time on stream and reached 52.44% after reaction for 8 h. There was no further increase in the yield of octadecanoic acid with time prolonged, because long-time running might lead to decarboxylation of some carboxylic acid. The reaction temperature is an important factor for this reaction. The temperature below 403 K is favorable for the formation of octadecanoic acid, but at temperature higher than 403 K, the yield of octadecanoic acid undergoes declining also owing to decarboxylation. Under appropriate conditions, Cr2O3-Co3O4/SiO2 can be a highly effective catalyst for oxidation of octadecanol with yield of 52.44% and selecivity of 99.93% for octadecanoic acid. 

chromium oxide; cobalt oxide; silica; supported catalyst; octadecanol; selective oxidation; octadecanoic acid