Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (3): 527-532.doi: 10.3866/PKU.WHXB201501052

• CATALYSIS AND SURFACE SCIENCE • Previous Articles     Next Articles

Preparation of Amorphous Co-B/γ-Al2O3 Catalyst and Its Performance in Catalytic Liquid Phase Hydrogenation of Ethyl Lactate

ZHAO Feng-Wei, SHEN Mei-Yu, WANG Lin, DU Chang-Hai   

  1. School of Chemical Engineering, Changchun University of Technology, Changchun 130012, P. R. China
  • Received:2014-11-05 Revised:2015-01-02 Published:2015-03-06
  • Contact: DU Chang-Hai E-mail:du661123@163.com
  • Supported by:

    The project was supported by the Natural Science Foundation of Jilin Provincial Science &Technology Department, China (201215117).

Abstract:

Supported cobalt amorphous catalysts Co-B/γ-Al2O3 were prepared using an impregnation-chemical reduction method for liquid phase hydrogenation of ethyl lactate to 1,2-propanediol (1,2-PDO). The Co-B/γ-Al2O3 catalysts were characterized using inductively coupled plasma (ICP) optical emission spectrometry, X-ray diffraction (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and X-ray photoelectron spectroscopy (XPS). The effects of the catalyst preparation conditions on the hydrogenation of ethyl lactate were investigated. All the fresh catalysts showed an amorphous structure and Co-B particles were dispersed uniformly on the γ-Al2O3 support. The thermal stability of the amorphous catalyst and the Co/B atomic ratio of surface composition increased with increasing the Co content. The Co-B/γ-Al2O3 amorphous catalyst showed the highest catalytic activity when the theoretical loading of metal Co was 30% (mass fraction, w). The ethyl lactate turnover frequency (TOF), conversion, and selectivity to 1,2-PDO reached 1.41 h-1, 93.63%, and 96.10%, respectively at a reaction temperature of 160 ℃ and hydrogen pressure of 6.0 MPa for 9 h. The higher catalytic performance of the 30%(w) Co-B/γ-Al2O3 supported amorphous catalyst is attributed to its highly dispersing Co-B particles, higher Co/B atomic ratio of surface composition, and electron transfer effect between Co and B.

Key words: Amorphous catalyst, Co-B/γ-Al2O3, Ethyl lactate, 1,2-Propanediol, Catalytic hydrogenation

MSC2000: 

  • O643