基于杂多类离子液体催化体系的甘油氢解反应研究

将一系列不同结构的离子液体与雷尼镍复合,作为甘油氢解制备丙二醇反应的催化剂。考察了离子液体结构对催化性能的影响,优选出具有适宜酸强度的固态磷钨酸质子化咪唑(HMIM]3PW12O40),采用FT-IR、1H-NMR及TG对其进行了表征。HMIM]3PW12O40/雷尼镍复合催化剂在用量HMIM]3PW12O400.2 mmol、雷尼镍0.3 g的条件下,催化20 g 40%甘油水溶液在6 MPa氢压(氢醇比为2.37∶1)下,230℃反应11 h,可得到甘油转化率83.3%,氢解产物1,2-丙二醇选择性57.3%的结果,催化剂具有良好的稳定性。

Hydrogenolysis of glycerol over a catalytic system based on heteropoly ionic liquid

A series of ionic liquids coupled with Raney Ni were used as dual functional catalysts in the hydrogenolysis reaction of glycerin to prepare propylene glycol. Effects of the ionic liquid structure on catalytic performance was studied. As a result, a solid heteropoly ionic liquid HMIM]₃PW₁₂O₄₀ with suitable acid strength was selected and characterized by FT-IR, ¹H-NMR and TG. The composite catalyst HMIM]₃PW₁₂O₄₀/Raney Ni could give 83.3% glycerol conversion and 57.3% selectivity for 1,2-propanediol under the optimized conditions: 20 g 40% glycerol solution, 0.2 mmol HMIM]₃PW₁₂O₄₀ and 0.3 g Raney Ni dosage, 6 MPa hydrogen pressure (hydrogen to alcohol 2.37:1), 230 ℃, 11 h. What's more, the low cost composite catalyst could be prepared simply and recycled easily with good stability.