Citation: QIU Song-Bai, WENG Yu-Jing, LIU Qi-Ying, MA Long-Long, ZHANG Qi, WANG Tie-Jun. Preparation of Highly Dispersed Co/SiO₂ Catalyst Using Ethylene Glycol and Its Application in Vapor-Phase Hydrogenolysis of Ethyl Lactate to 1,2-Propanediol[J]. Acta Physico-Chimica Sinica, ;2016, 32(6): 1511-1518. doi: 10.3866/PKU.WHXB201603094 shu

Preparation of Highly Dispersed Co/SiO₂ Catalyst Using Ethylene Glycol and Its Application in Vapor-Phase Hydrogenolysis of Ethyl Lactate to 1,2-Propanediol

Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China

Received Date: 1 March 2016
Revised Date: 7 March 2016

Fund Project: The project was supported by the National High-Tech Research and Development Program of China (863)(2012AA101806) and National Natural Science Foundation of China (21306195, 51276183).

Highly dispersed Co catalysts supported on SiO₂ were prepared in the presence of ethylene glycol (EG) by co-impregnation and tested in the vapor-phase hydrogenolysis of ethyl lactate to 1,2-propanediol. The synthesis parameters of Co metal loading, ratio of EG to cobalt nitrate, type of alcohol and calcination temperature, which influenced the physical properties of the Co₃O₄ nanoparticles, were investigated through the use of X-ray diffraction (XRD). It revealed that the ratio of EG to cobalt nitrate and the type of alcohol significantly affected the particle size of Co₃O₄ supported on SiO₂. During co-impregnation with EG, the interaction between Co²⁺ and the SiO₂ support was strongly enhanced, resulting in the high dispersion of cobalt species and the decrease of Co₃O₄ particle size from 16 nm to below 5 nm; the significantly enhanced cobalt dispersion was associated with the formation of amorphous cobalt silicate. Meanwhile the conversion of ethyl lactate was greatly improved to 98.6% from 69.5%, with 98.0% selectivity of 1,2-propanediol over 10% (w, mass fraction) Co/SiO₂ catalysts under the given reaction conditions (2.5 MPa and 160 ℃). The obtained catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), N₂ adsorption-desorption measurements, and H₂ temperature-programmed reduction (H₂-TPR) methods.
- Co/SiO₂,
- Co-impregnation,
- Ethyl lactate hydrogenation,
- 1,2-Propanediol,
- Ethylene glycol
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沈阳化工大学材料科学与工程学院沈阳 110142

Preparation of Highly Dispersed Co/SiO2 Catalyst Using Ethylene Glycol and Its Application in Vapor-Phase Hydrogenolysis of Ethyl Lactate to 1,2-Propanediol

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通讯作者: 陈斌, bchen63@163.com

Preparation of Highly Dispersed Co/SiO₂ Catalyst Using Ethylene Glycol and Its Application in Vapor-Phase Hydrogenolysis of Ethyl Lactate to 1,2-Propanediol