Chinese Journal of Catalysis ›› 2012, Vol. 33 ›› Issue (10): 1696-1705.DOI: 10.3724/SP.J.1088.2012.20533

• Research papers • Previous Articles     Next Articles

Conversion of Biomass-Derived Carbohydrates to Methyl Lactate Using Sn-MCM-41 and SnO2/SiO2

LIU Zhen1,2, FENG Gang1, PAN Chunyan1, LI Wang1, CHEN Ping1, LOU Hui1,*, ZHENG Xiaoming1   

  1. 1Institute of Catalysis, Department of Chemistry, Zhejiang University, Hangzhou 310028, Zhejiang, China; 2Shaoxing Testing Institute of Quality Technical Supervision, Shaoxing 312071, Zhejiang, China
  • Received:2012-05-21 Revised:2012-07-03 Online:2012-09-28 Published:2012-09-28

Abstract: Biomass is a promising alternative for sustainable supply of precious intermediates and fine chemicals to the chemical industry. Lactic acid (2-hydroxypropanoic acid) and its related alkyl lactates are widely used in chemicals, food, pharmaceuticals, and cosmetic products. A study of the liquid-phase conversion of biomass-derived carbohydrates directly to methyl lactate catalyzed by Sn-MCM-41 and SnO2/SiO2 in subcritical methanol is presented. With glucose as substrate, methyl lactate yield reached 40.3% under the optimal reaction conditions. Fresh and used catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, transmission electron microscopy, infrared spectroscopy with pyridine adsorption, and NH3 temperature-programmed desorption techniques. Methyl lactate yield was closely related to reaction temperature, reaction time, and the acidic site amount of catalysts. The catalysts were active and can be reused without significant decrease in the catalytic activity after being used for five recycles. The mesoporous structure and acid sites of the reused catalysts did not change much and the leaching of Sn was less than 0.15%. They were easy and relatively rapid synthesis, operational simplicity, reusability, and safe handling.

Key words: biomass-derived carbohydrate, methyl lactate, MCM-41, tin oxide, silica, acidity