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中文摘要：
采用水热法制备Fe3O4纳米颗粒,并进行脱水催化性能研究.考察催化剂Fe3O4纳米颗粒的用量及循环利用次数对苹果酸二乙酯的酯化率和转换数的影响.通过不同催化过程后的Fe3O4纳米颗粒的形貌的变化,研究Fe3O4纳米颗粒在催化中的脱水性与酸性敏感性,进而利用Fe3O4纳米颗粒的成环反应合成1,4-二噻烷.实验结果表明：水热法制备的Fe3O4纳米颗粒可以作为催化剂合成苹果酸二乙酯,最佳的催化剂条件为第1次催化循环0.1mmol Fe3O4纳米颗粒,Fe3O4纳米颗粒的催化活性随循环利用次数的增加而降低.
英文摘要：
Fe3O4 nanoparticles were synthesized by hydrothermal method and the catalytic performance of dehydration was studied.The effects of the used amount of Fe3O4 nanoparticles and catalytic cycle on the yield and turnover number of diethyl malate were investigated.By changing the morphology of Fe3O4 nanoparticles after different catalytic cycle process.We researched the dehydrating ability and acid sensitivity of the Fe3O4 nanoparticles in the catalysis.Furthermore,1,4-dithiane was synthesized by a cyclocondensation of Fe3O4 nanoparticles.The experimental results showed that：Fe3O4nanoparticles prepared by hydrothermal method can be used as the catalyst for diethyl malate.The best condition of catalyst was the first cycle of 0.1mmol Fe3O4 nanoparticles.The catalytic activity of Fe3O4 nanoparticles decreased with increasing of the catalytic cycles.
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