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Citation: ZHAO Rui-Hua, DONG Mei, QIN Zhang-Feng, DING Jian-Fei, GUO Xing-Cui, WANG Jian-Guo. Synthesis and Characterization of CoAPO-5 with different Cobalt Contents and Their Catalytic Performance for Cyclohexane Oxidation[J]. Acta Physico-Chimica Sinica, ;2008, 24(12): 2304-2308. doi: 10.3866/PKU.WHXB20081226 shu

Synthesis and Characterization of CoAPO-5 with different Cobalt Contents and Their Catalytic Performance for Cyclohexane Oxidation

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China; Graduate School of the Chinese Academy of Sciences, Beijing 100049, P. R. China; 3Shanxi Kunming Tobacco Limited Liability Company, Taiyuan 030012, P. R. China

Received Date: 11 June 2008
Available Online: 13 October 2008

Cobalt substituted molecular sieves (CoAPO-5) with different cobalt content were synthesized
hydrothermally. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), thermogravimetric(TG) analysis, and inductively coupled plasma-atomic emission spectrometry (ICP-AES). The results indicated that cobalt was incorporated into the framework of AlPO4-5 molecular sieves and the as-synthesized CoAPO-5 was highly crystalline and pure. There is a od linear relationship between the crystal cell parameters and the cobalt content in CoAPO-5. The UV-Vis intensity of Co(II) is significantly reduced through calcinations as Co(II) is oxidized to Co(III) during calcinations. The as-synthesized CoAPO-5 exhibited excellent performance for the oxidation of cyclohexane using molecular oxygen as oxidant. The conversion of cyclohexane and the ratio of cyclohexanol to cyclohexanone in the product increased as the cobalt content increased in CoAPO-5. At nCo/nP=0.04 the conversion of cyclohexane was 23.3%.
- Aluminophosphate molecular sieves,
- Hydrothermal synthesis,
- Cobalt incorporation,
- Cyclohexane oxidation,
- Cyclohexanone
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