将Ta₂O₅作为催化剂用于葡萄糖制备乳酸，结果发现Ta₂O₅的催化效果比较优异。利用SEM对Ta₂O₅进行表征，结果表明，Ta₂O₅表面由许多球状颗粒堆砌形成，颗粒尺寸为200~300 nm。此外，利用正交实验分析不同反应条件对催化效果的影响程度，实验证明反应温度 > 底物质量浓度 > 反应时间 > 催化剂质量。最后考察了催化剂重复使用性能和不同反应条件对于催化效果的影响，结果表明，反应温度为190℃、反应时间为4 h、底物质量浓度为6 g/L、催化剂质量为0.06 g时，催化效果最佳，葡萄糖转化率达到92.3%，乳酸得率达到71.9%。催化剂经重复使用5次后，乳酸得率仍有46.7%。

Ta₂O₅ is selected as the catalyst for the conversion of glucose to lactic acid.It is found that Ta₂O₅ exhibits an excellent catalytic performance.SEM characterization shows that Ta₂O₅ surface is composed of many spherical particles with a size of 200-300 nm.In addition,orthogonal experiments are performed to analyze the influence level of different reaction conditions on catalytic efficiency.Experimental results indicate that the order of influence degree from big to small is reaction temperature,substrate concentration,reaction time,catalyst dosage.Finally,the reusability of catalysts and the effects of different reaction conditions on the catalytic efficiency are investigated.The results show that the conversion of glucose and the yield of lactic acid are 92.3% and 71.9%,respectively under the best conditions that reaction temperature is set at 19℃,the reaction time is 4 h,the concentration of substrate is 6 g·L^-1 and 0.06 g of catalyst is added.The yield of lactic acid can still reach 46.7% after the catalyst is used for five times.

余开荣(1993-),男,硕士研究生,主要从事生物质科学与工程和生物质基化学品研究,18292560212@163.com