SO_4^(2-)/Fe_2O_3-Al_2O_3-SiO_2固体超强酸的制备及其催化水解蔗糖生成乙酰丙酸

Preparation of SO_4^(2-)/Fe_2O_3-Al_2O_3-SiO_2 Solid Superacid Catalyst for Producing Levulinic Acid from Hydrolysis of Sucrose

通过共沉淀法制备了不同比例的SO24-/Fe2O3-A l2O3-S iO2固体超强酸,并将其用于蔗糖的催化水解制备乙酰丙酸。实验结果发现:焙烧时间和焙烧温度对比表面积的影响较大,焙烧时间越短,焙烧温度越低,比表面积就会更大;硫酸浸渍浓度和浸渍时间对催化剂的性质也有一定影响。将固体超强酸作催化剂用于蔗糖催化水解制乙酰丙酸,结果发现焙烧温度600℃、焙烧时间4 h制备的催化剂的活性较高,乙酰丙酸的产率也较高,达到33.05%。

SO2-4 /Fe2O3-Al2O3-SiO2 solid superacids of different proportions were prepared by co-deposition method and used for the reacion of catalytic hydrolysis of sucrose to produce levulinic acid.The results showed that calcination time and the dipping concentration of sulfuric acid affected the property of these catalysts.Calcination time and temperature affected surface area seriously.The shorter the calcination time and lower the calcination temperature,the larger was the specific surface area.The impregnation concentration by H2SO4 and impregnation time also impact the catalyst properties.The solid superacids were used for the catalytic hydrolysis of sucrose to produce levulinic acid.The improved activity was obtained under following conditions： calcination temperature 600 ℃,calcination time 4 h.The high yield of levulinic acid was obtained 33.05 %.