Sol-Gel法制备S2O82-/TiO2固体酸并用于生物质水解的研究(英文)

Preparation of S_2O_8^(2-)/TiO_2 Solid Acid by Sol-Gel Method and Its Biomass Hydrolysis Application

以钛酸丁酯,无水乙醇,冰醋酸为原料,过硫酸铵为负载体,采用溶胶-凝胶法,通过均匀实验改变过硫酸铵浓度、烘焙时间及烘焙温度三个变量制备S_2O_8^(2-)/TiO_2固体酸。通过红外光谱仪及氮吸附比表面仪对固体超强酸进行性能测定。用此催化剂在160℃条件下的高压反应釜中催化蔗糖进行24 h反应得乙酰丙酸,采用液相色谱法对产物乙酰丙酸进行定量定性分析。结果显示:制备催化剂的最佳实验条件为焙烧温度为500℃,焙烧时间为5 h,过硫酸铵溶度为0.05 mol/L,乙酰丙酸的收率达到了47%。

The catalysts were prepared by Sol-Gel method from C_(16)H_(36)O_4Ti,CH_3CH_2OH CH_3COOH and(NH_4)_2S_2O_8 and got with the formula of S_2O_8^(2+)/TiO_2 by changing the concentration of ammonium persulfatc,calcination time and temperature.They were characterized by 1R and BET.Levulinic acid was got from sucrose by catalytic hydrolyzation in autoclave at 160 ℃ for 24 h and analyzed with the HPLC equipped with an Aminex- HPX-87H(300 mm×7.8 mm).The results show that the yield of levulinic acid would reach 47%under the condition of calcinating temperature of 500 ℃ for 5 h and the concentration of ammonium persulfate of0.05 mol/L.