文档介绍：锰氧化物合成及催化酯化反应的研究
摘要:本论文通过对一系列纳米结构锰氧化物的制备及对其性质的表征,旨在寻找具有特殊性能的新型催化剂及其制备方法。实验利用Zn(Ac)2 和Mn(Ac)2为原料,H2O2为氧化剂在NaOH溶液中共沉淀制备ZnMn2O4。基于这种方法,改变反应条件(反应物摩尔配比,氧化剂用量,陈化时间,反应温度等)最终在常温常压的温和条件下得到了单一晶形的均匀纳米颗粒,粒径在10nm ~20nm。同时也利用水热法制得了α-MnO2纳米线,λ-MnO2纳米颗粒。最后利用XRD,TEM对所制得的产品进行表征。利用在不同条件下制得的一系列锰的氧化物催化合成乙酸异戊酯,分别得到其酯化率为:α-MnO2纳米线:80%左右;λ-MnO2纳米颗粒:86%左右;ZnMn2O4(煅烧200℃~500℃):88%~94%。
关键词:纳米结构锰氧化物;纳米颗粒;水热法;乙酸异戊酯;酯化率
Abstract: In order to look for the method of preparing new pattern of catalyst,which had some special performances, we prepared a chain of nanostructured manganese oxides and attributed their behavior in this articles. Zn(Ac)2 and Mn(Ac)2 were used to prepare ZnMn2O4 in the NaOH solution by the oxidizer of H2O2. Based on such a method, we transferred reaction conditions, such as the mol matching of the reactant, oxidizer dosage, ageing time , reaction temperature and so on. Ultimately, we had received unique crystal form and uniform nanoparticles, their diameter is about 10nm ~20nm. Meanwhile, α-MnO2 nanolines and λ- MnO2 nanoparticles were synthesized by the method of hydrothermal synthesis. Finally,XRD and TEM techniques were used to characterize the as-prepared products. Then we synthesized isoamyl acetate by using manganic oxide that been synthesized in different condition. The esterification ratio was concluded that α-MnO2 nanolines: about 80%, λ- MnO2 nanoparticles: about 86%, ZnMn2O4 (furnacing200℃~ 500℃):88%~94%.
Keywords: nanostructured manganese oxides; nanoparticles; hydrothermal synthesis;
isoamyl acetate; esterification ratio
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