Abstract: Cyclohexanone 1,2-propanediol ketal was synthesized by using cyclohexanone 1,2-propylene glycol as starting materials and silica-supported ferric sulfate \[Fe₂(SO₄)₃/SiO₂\] solid acid as a catalyst under solvent-less conditions. The catalyst was prepared by sol-gel and impregnation methods. Efects of factors on yield of product，such as calcination temperature of Fe₂(SO₄)₃/SiO₂ solid acid catalyst, the mass fration of Fe₂(SO₄)₃, molar ratio of the reactant，reaction time，mass fraction of catalyst and its stability，were investigated in detail. The results show that the Fe₂(SO₄)₃/SiO₂ has high catalytic activities. The optimal reaction conditions are: calcination temperatures of Fe₂₍SO₄)₃/SiO₂ solid acid catalyst 300 ℃, the mass fration of Fe₂(SO₄)₃ in SiO₂ 20%, molar ratio of cyclohexanone to 1,2-propanediol 1∶1, the mass fraction of catalyst 5% and the reaction time 70 min. Under the above conditions the yield of cyclohexanone 1,2-propanediol ketal is 98.21%. Fe₂(SO₄)₃/SiO₂ catalyst is excellent in stability and reusability，and yield of cyclohexanone 1,2-propanediol ketal keeps at 88.90% after being used for 5 times

Key words: Sol-gel ,  , Ferric sulfate ,  Solid acid ,   Ketalization ,  Cyclohexanone 1,2-propanediol ketal

摘要： 采用溶胶-胶凝法和浸渍法制备了二氧化硅负载的硫酸铁[Fe₂(SO₄)₃/SiO₂]固体酸催化剂,以环己
酮和1,2-丙二醇为原料,在无溶剂条件下合成了环己酮1,2-丙二醇缩酮。考察了Fe₂(SO₄)₃/SiO₂ 固体酸催化剂
的焙烧温度、Fe₂(SO₄)₃ 在SiO₂ 上的负载量、醇酮物质的量比、催化剂质量和反应时间等因素对产品收率的影响。
实验结果表明,Fe₂(SO₄)₃/SiO₂ 固体酸是合成环己酮1,2-丙二醇缩酮的理想催化剂,较适宜的反应条件为:催化
剂的焙烧温度300℃、Fe₂(SO₄)₃ 在SiO₂ 上的负载量20%、环己酮与1,2-丙二醇的物质的量比1∶1、催化剂质量
分数5%和反应时间70min。在此条件下,环己酮1,2-丙二醇缩酮收率达到98.21%。Fe₂(SO₄)₃/SiO₂催化剂具
有良好的稳定性,重复使用5次后环己酮1,2-丙二醇缩酮的收率为88.90%。

关键词: 溶胶-胶凝,  , 硫酸铁 ,  , 固体酸 , 缩酮化反应 , 环己酮1, 2-丙二醇缩酮