磁性SO4^2-／TiO2／Fe3O4／PAL固体酸催化剂的制备及其催化酯化性能

Preparation of Magnetic SO_4^(2-)/TiO_2/Fe_3O_4/Palygorskite Solid Acid Catalyst and Its Catalytic Activity for Esterification

以凹凸棒石黏土(PAL)为载体,通过沉淀法和溶胶法负载Fe3O4和TiO2前驱体,随后酸化、煅烧制备了磁性SO42-/TiO2/Fe3O4/PAL固体酸催化剂。利用XRD、TEM、FT-IR、EDX和SQUID对催化剂进行表征,并用于催化乙酸正丁酯的合成。考察了Fe3O4、PAL、TiO2含量和煅烧温度对催化剂活性的影响。结果表明,SO42-/TiO2/Fe3O4/PAL固体酸催化剂具有较高的催化活性和较强的磁性能,磁性材料和载体提高了催化剂活性,对乙酸正丁酯的合成反应活性高达93.9%,使用7次,其酯化率仍能达到79.4%。

Magnetic SO42/TiOE/Fe3O4/palygorskite solid acid catalyst was prepared using palygorksite as the support after loading FeaO4 and TiO2 precursor via the precipitation method and sol-gel method, followed by acidification and calcination. The catalysts were characterized by XRD, TEM, FT-IR, EDX and SQUID and used for the synthesis of butyl acetate. The effects of Fe3O4, palygorskite, TiO2 content, and calciantion temperature on the catalytic properties of the catalyst were also investigated. The results indicated that the catalyst exhibited high catalytic activity and good magnetic properties. The introduction of Fe3O4 and palygorskite could increase the activity of catalysts. The esterifieation rate could reach to 93.9%. The catalysts also exhibited good stability and its esterification rate was 79.4% after using seven times.