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Biomass Chemical Engineering ›› 2019, Vol. 53 ›› Issue (3): 15-23.doi: 10.3969/j.issn.1673-5854.2019.03.003

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Preparation of Yb(OTf)3 Immobilized on Mesoporous Silica and Its Catalytic Activity for Lactic Acid Productionfrom Glucose

Shiwei WANG,Qibao WANG*()   

  • Received:2018-05-31 Online:2019-05-30 Published:2019-06-04
  • Contact: Qibao WANG E-mail:wqb@cumtb.edu.cn
  • Supported by:
    中央级公益性科研院所基本科研业务费专项资金(Z2060302149054)

Abstract:

Two kinds of SBA-15 and MCM-41 mesoporous silica were prepared by solvent and calcination method, and they were used as the carrier of the supported ytterbium triflate(Yb(OTf)3) catalysts. The carriers and catalysts were characterized by small angle X-ray diffraction(SAXD), nitrogen adsorption/desorption, 29Si solid state nuclear magnetic resonance spectroscopy(NMR), transmission electron microscope(TEM) and thermogravimetric analysis(TG), and the catalytic performances of these catalysts in the preparation of lactic acid from glucose were evaluated. The experimental results showed that the amount of hydroxyl group of mesoporous silica by solvent method was higher than that of mesoporous silica by calcination method, so its catalytic activity was higher. The average pore size of SBA-15 was about 3 nm larger than that of MCM-41, which led to better mass transfer performance of SBA-15 and better catalytic performance of Yb(OTf)2-SBA-15. The yield of lactic acid could reach 42.35% when it reacted at 2 MPa N2 pressure and 190 ℃ for 60 min with Yb(OTf)2-SBA-15-S as catalyst.

Key words: mesoporous silica, ytterbium triflate, glucose, lactic acid

CLC Number: