含镧固体酸催化蔗糖制备乙酰丙酸的研究

范文编号:HG084  范文字数:12342,页数:26

摘 要：本文采用溶胶-凝胶法制备稀土改性的新型固体超强酸S2O82-/TiO2-La2O3催化剂。采用单因素试验法，通过改变镧的含量，焙烧温度和焙烧时间等条件制备一系列固体酸催化剂。通过BET表面吸附仪，红外光谱仪对催化剂的比表面积和表面结构进行表征。在一定条件下以生物质蔗糖为原料，进行催化水解转化为乙酰丙酸反应，利用高效液相色谱仪对催化剂的活性进行分析。实验结果表明：S2O82-/TiO2-La2O3催化剂在镧含量为1.2%，焙烧温度为750℃，焙烧时间为3h时具有最高的催化活性；同时，反应温度为160℃，反应时间为24小时，催化剂加入量为0.3g，乙酰丙酸的收率最高。

关键词：S2O82-/TiO2-La2O3固体酸催化剂；乙酰丙酸；溶胶凝胶法；蔗糖。

Preparation of levulinic acid from sucrose over La solid acid catalyst

Abstract: A new type of rare earth solid superacid catalyst S2O82-/TiO2-La2O3 was prepared by The Sol-gel method in this paper. A series of catalysts were prepared by single factor test method with changing the La content, temperature and time of calcination. The specific surface area and the surface structure of the Catalyst were characterized by means of BET adsorption and infrared spectroscopy. The levulinic acid were prepared from Sucrose by catalytic and hydrolysis under certain conditions, and the activity of the catalytic was analysed by liquid chromatography. The results of the experiment show that：The Catalyst haved the highest activity when the La content of 1.2%, calcination temperature of 750 ℃ and the calcination time of 3 hours. Then, The highest yield of levulinic acid had reached when the reaction temperature was 160 ℃, reaction time was 24 hours, amount of catalyst was 0.3g.

 Keywords: S2O82-/TiO2-La2O3 Solid acid catalyst; Levulinic acid; Sol-gel method; Sucrose.
 
 
 目  录
中文摘要 I
英文摘要 II
目录 III
1  绪论 1
1.1  前言 1
1.2 乙酰丙酸 3
1.3 固体超强酸 7
1.4  本章小结 10
2 实验部分 11
2.1 实验试剂与仪器 11
2.2 催化剂的制备 11
2.3 催化剂的表征 12
2.4 乙酰丙酸的制备和检测 13
2.5 本章小结 13
3 结果与讨论 14
3.1 固体超强酸比表面积分析 14
3.2 固体超强酸红外光谱分析 15
3.3 固体超强酸活性分析 16
3.5 本章小结 18
4 总结与展望 19
致  谢 20
参考文献 21

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