磁性SO_4^(2-)/ZrO_2/Fe_3O_4/凹凸棒石固体酸催化剂的制备及催化性能

Preparation of Magnetic SO_4^(2-)/ZrO_2/Fe_3O_4/Palygorskite Solid Acid Catalyst and its Catalytic Properties

以凹凸棒石(palygorskite,PAL)黏土为载体,采用共沉淀法制备了SO24-/ZrO2/Fe3O4/PAL固体酸催化剂。利用X射线衍射、透射电子显微镜、能谱和超导量子干涉仪对催化剂进行了表征,并用于催化乙酸正丁酯的反应,考察了Fe3O4、ZrO2含量和煅烧温度对催化剂活性的影响。结果表明:SO24-/ZrO2/Fe3O4/PAL固体酸催化剂具有较高的催化活性和较强的磁性能,磁性材料的引入提高了催化剂活性,对乙酸正丁酯的合成反应活性高达89.26%,使用4次后其酯化率还能达到74.53%。

SO42-/ZrO2/Fe3O4/palygorskite solid acid catalysts were prepared using palygorskite as a support via a coprecipitation method.The catalysts were characterized by X-ray diffraction,transmission electron microscopy,energy dispersive X-ray spectros-copy and superconductivity quantum interference device,respectively,to investigate the catalysis of butyl acetate synthesis.The ef-fects of Fe3O4,ZrO2,and calcination temperature on the catalytic properties of the catalyst were also investigated.The results show that the catalyst exhibits a higher catalytic activity and the more intensive magnetic characterization,and the esterification rate is 89.26%.The addition of Fe3O4 could improve the activity of catalyst and facilitate the separation and recovery of the catalyst.The esterification rate could still be 74.53% after used for four times.