Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (10): 1642-1649.DOI: 10.1016/S1872-2067(11)60434-8

• Research papers • Previous Articles     Next Articles

Effect of Metal Additives on Structure and Properties of a Co/SiO2 Hydrogenation Catalyst

XUE Jingjing1,2, CUI Fang1, HUANG Zhiwei1, ZUO Jianliang1,2, CHEN Jing1,a, XIA Chungu1,b   

  1. 1State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-04-30 Revised:2012-06-15 Online:2012-09-28 Published:2012-09-28

Abstract: The effects of metal additives (Zn, Fe, Cu, and Sn) on the properties and catalytic performance of a Co/SiO2 catalyst (prepared by a co-precipitation method) in the liquid-phase hydrogenation of ethyl lactate were investigated. The electronic properties and surface distribution of Co in the catalyst were significantly changed by incorporation of the additives. The particle size of the cobalt species was reduced, which strengthened the interaction between the cobalt particles and the silica support and decreased the reducibility of the catalyst. As a consequence, both ethyl lactate conversion and 1,2-propanediol selectivity decreased upon incorporation of the additives. Ethyl lactate conversion was related less to the size and surface area of the catalyst particles than to the distribution of the cobalt species and the reducibility of the catalyst.

Key words: cobalt, metal additive, structure, ethyl lactate, hydrogenation