为降低酯化催化剂的制备成本,提高催化酯化反应的性能,以磺酸型阳离子交换树脂和FeCl_3·6H_2O为原料,采用液固溶剂法制备了固体酸催化剂.利用XRF,FTIR,XRD,NH_3-FTIR对催化剂进行表面酸性、元素含量等性质的测试表征.研究表明,FeCl_3与阳离子交换树脂的Bronsted酸中心(SO_3H)发生化学反应形成了新的Lewis酸中心,络合到树脂上的Fe~(3+)量为11.8%.测试了催化剂促进乳酸铵和正丁醇酯化反应的催化活性,当催化剂用量为1.5%时,酯化率高达96.1%.
To decrease the cost of esterification catalyst and enhance the catalytic activity of esterification, the cation exchange resin catalyst was prepared by liquid-solid solvent method, using sulfoacid cation exchange resin and FeCl_3·6H_2O as raw materials. Its properties, such as surface acidity and element content, were investigated by XRF, FT -IR, XRD and NH_3 -FTIR techniques. Results show that FeCl_3 reacts with a sulpho-nate structure of the resin Bronsted acid to form a new Lewis acid center, and the content of Fe~(3+) in Fe-cation resin is 11.8%. The catalytic activity for esterification of ammonium lactate with n-butanol was tested. It is found that the highest esterification yield will be up to 96. 1% when the concentration is 1.5 wt%.
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