Acta Phys. -Chim. Sin. ›› 2016, Vol. 32 ›› Issue (6): 1511-1518.doi: 10.3866/PKU.WHXB201603094

• ARTICLE • Previous Articles     Next Articles

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

Song-Bai QIU,Yu-Jing WENG,Qi-Ying LIU,Long-Long MA,Qi ZHANG,Tie-Jun WANG*()   

  • Received:2016-03-01 Published:2016-06-03
  • Contact: Tie-Jun WANG E-mail:wangtj@ms.giec.ac.cn
  • Supported by:
    The project was supported by the National High-Tech Research and Development Program of China (863)(2012AA101806);National Natural Science Foundation of China(21306195, 51276183)

Abstract:

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.Thesynthesis parameters of Co metal loading,ratio of EG to cobalt nitrate,type of alcohol and calcinationtemperature,which influenced the physical properties of the Co3O4 nanoparticles,were investigated throughthe use of X-ray diffraction(XRD).It revealed that the ratio of EG to cobalt nitrate and the type of alcoholsignificantly affected the particle size of Co3O4 supported on SiO2.During co-impregnation with EG,the interactionbetween Co2+ and the SiO2 support was strongly enhanced,resulting in the high dispersion of cobalt speciesand the decrease of Co3O4 particle size from 16 nm to below 5 nm;the significantly enhanced cobalt dispersionwas associated with the formation of amorphous cobalt silicate.Meanwhile the conversion of ethyl lactate wasgreatly 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 photoelectronspectroscopy(XPS),N2 adsorption-desorption measurements,and H2 temperature-programmed reduction(H2-TPR)methods.

Key words: Co/SiO2, Co-impregnation, Ethyl lactate hydrogenation, 1,2-Propanediol, Ethylene glycol

MSC2000: 

  • O643