ZnMn_2O_4纳米催化剂制备及催化合成乙酸正丁酯

Preparation of ZnMn_2O_4 Nano-catalyst and Its Application in Synthesis of n-Butyl Acetate

利用共沉淀法制备了四方晶系锌锰复合氧化物ZnMn2O4纳米催化剂,X射线粉末衍射（XRD）和透射电子显微镜（TEM）结果表明,所合成的催化剂为粒径均匀的纳米粒子,平均粒径在20-50 nm,具有较好的分散性,对乙酸正丁酯的合成有较高的催化活性。确定了适宜的酯化反应条件,以焙烧温度为300℃制备的ZnMn2O4为催化剂,在催化剂用量为0.3%（以反应物总质量计）、n（酸）∶n（醇）=1.8∶1、反应时间为4 h、酯化反应温度120℃的条件下,酯化率可达92.53%。

A zinc manganese oxide nano-catalyst was synthesized by a co-precipitation method.X-ray diffraction（XRD） and transmission electron microscopy（TEM） results indicate that the sample can be indexed to tetragonal ZnMn2O4 and the particle size ranges from 20 to 50 nm.The obtained ZnMn2O4 nanoparticles were used as a catalyst for the esterification reaction between acetic acid and n-butanol.The experimental results show that ZnMn2O4 nanoparticles had a high catalytic activity on the synthesis of n-butyl acetate.The influential factors including catalyst calcination temperature,acid-to-alcohol molar ratio,dosage of the catalyst and reaction time on the yield of n-butyl acetate were also investigated,and the maximal esterification rate of up to 92.53% was achieved under the following conditions： catalyst calcination temperature=300 ℃,n（acid）∶n（alcohol）=1.8∶1,the dosage of the ZnMn2O4 catalyst is 0.3%（in total mass of reactants）,reaction time is 4 h and esterification reaction temperature is 120 ℃.