The catalytic performance of Yb(OTf) 2 –SO 3 –SBA-15 in the transformation of cellulose into lactic acid was investigated in this paper. The sol–gel technique and the chemical grafting approach were introduced to obtain the SBA-15 and Yb(OTf) 2 –SO 3 –SBA-15, respectively. Yb(OTf) 2 –SO 3 –SBA-15 catalysts were characterized by elemental analysis, ICP-OES, XRD, N 2 adsorption, FTIR, TGA, 29 Si-MAS NMR, SEM and TEM. It is found that the Yb(OTf) 2 –SO 3 –SBA-15 catalyst can catalyze the transformation of cellulose into lactic acid effectively. When the temperature is 220 °C and the reaction time is 60 min, the maximum yield of lactic acid can reach 74.06%. Yb(OTf) 2 –SO 3 –SBA-15 catalyst can be recycled for more than five times without noticeable loss in activity.
Ytterbium triflate was immobilized on SBA-15 via chemical grafting and co-condensation and the catalytic performance of the immobilized ytterbium triflate for the selective conversion of glucose into lactic acid was investigated in this paper. The characterization results showed that ytterbium triflate was immobilized on SBA-15 successfully. It was found that the immobilized ytterbium triflate catalyst can catalyze the transformation of glucose into lactic acid effectively. The 58.01% yield of lactic acid was obtained from glucose at 200 °C. The HPLC analysis results of the products showed that the glyceraldehyde might act as an intermediate for the formation of lactic acid during the reaction. The immobilized ytterbium triflate catalyst was recycled for more than five times without noticeable loss in activity.
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