固体酸催化5-羟甲基糠醛的降解动力学研究

Decomposition Kinetics of 5-Hydromethylfurfural Catalyzed by Solid Acids

利用小型高压反应釜测定了温度在423.15～463.15 K范围内无催化、固体酸SO42-/ZrO2-TiO2和SO42-/ZrO2催化下5-羟甲基糠醛的分解反应动力学数据。结果表明,反应时间、反应温度和固体酸催化剂显著影响了5-羟甲基糠醛的转化和乙酰丙酸的产率。用一级反应动力学方程拟合实验数据,得到本实验中无催化、固体酸SO24-/ZrO2-TiO2和SO42-/ZrO2催化下5-羟甲基糠醛分解反应的表观活化能分别为106.4、73.42和77.04 kJ/mol。固体酸的加入可以大大提高了5-羟甲基糠醛的转化率,同时提高乙酰丙酸的产率。

The data about the decomposition kinetics of 5-hydromethylfurfural（5-HMF） without any catalyst and catalyzed by solid acid SO4 -/ZrO2-TiO2 and SOl -/ZrO2 at temperatures from 423.15 K to 463.15 K was obtained by conducting decomposition re- action in a small high-pressure batch reactor respectively. The results showed that the effects of reaction time, reaction tempera- ture and solid acids on the 5-HMF conversion and the levulinic acid（LA） yield were significant. After fitting experimental data with the first-order kinetics equation, the evaluated apparent activation energy of 5-HMF decomposition was 106.4 kJ/mol without any catalyst, 73.42 kJ/mol catalyzed with solid acid SO42 -/ZrO2-TiO2 and 77.04 kJ/mol with solid acid SO42-/ZrO2, respective- ly. On the other hand, the solid acid catalysts are easy to be recycled and reusable.