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›› 2008, Vol. 8 ›› Issue (1): 192-196.

• 材料工程专栏 • 上一篇    下一篇

用于酯化反应的堇青石担载固体酸催化剂的制备工艺探索

张琦,王铁军,吴创之,马隆龙   

  1. 中国科学院广州能源研究所
  • 出版日期:2008-02-20 发布日期:2008-02-20

Preparation of Cordierite-supported Solid Acid Catalyst for Esterification

ZHANG Qi,WANG Tie-jun,WU Chuang-zhi,MA Long-long   

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
  • Online:2008-02-20 Published:2008-02-20

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被引次数

2

摘要： 以堇青石为载体担载固体酸催化剂活性组分，以乙酸与乙醇合成乙酸乙酯的反应为模型反应，考察多种制备条件对堇青石担载固体酸催化剂酯化活性的影响，筛选最佳制备工艺. 结果表明，固体酸颗粒悬浊液性质均一、稳定，浸渍液中添加g-Al2O3或聚乙二醇会阻碍催化剂表面活性的发挥. 以悬浊液为浸渍液，1 mol/L H2SO4溶液达50%(j)的工艺条件下，堇青石担载固体酸催化剂酯化活性最高. 堇青石表面担载的固体酸是酯化活性中心，全回流反应100 min，乙酸的转化率达到79.2%，二次利用时转化率为一次转化率的95.6%. 堇青石担载固体酸催化剂制备工艺的平行性和稳定性较好，催化剂外形规整，孔道均匀整齐，在保持高活性的同时，达到催化剂成型和提高酯化催化剂经济性的目的.

关键词: 固体酸, 堇青石, 催化酯化, 制备工艺, 浸渍法

Abstract: Cordierite was taken as carrier to support activated solid acid in order to find out the optimum technical process to prepare cordierite-supported solid acid catalyst and guarantee the high esterification activity according to the model reaction of acidic acid and ethanol to ethyl acetate. The suspending solution of solid acid fine particles was homogeneous and steady, but g-Al2O3 or PEG addition deactivated the modified catalyst. The suspending solution with activated components and 1 mol/L H2SO4 of 50% volume ratio was proved to be best impregnation medium. The solid acid was testified as activated center on the cordierite surface, which showed best activity with acetic acid conversion rate of 79.2%, and 95.6% of that in the 2nd run in 100 min total reflux esterification of ethanol and acetic acid. The preparation process was repeatable and reliable, and can guarantee the modified cordierite catalyst with the suitable dimensions, uniform tunnels, and high esterification activity and economically availible as well.

Key words: solid acid, cordierite, catalytic esterification, preparation process, impregnation