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Magnetically-separable Fe3O4@SiO2@SO4-ZrO2 core-shell nanoparticle catalysts for propanoic acid esterification
Molecular Catalysis ( IF 4.6 ) Pub Date : 2018-03-20 , DOI: 10.1016/j.mcat.2018.02.021
Zhijun Tai , Mark A. Isaacs , Lee J. Durndell , Christopher M.A. Parlett , Adam F. Lee , Karen Wilson

Monodispersed, sulfated zirconia encapsulated magnetite nanoparticles were synthesized as magnetically-separable solid acid catalysts. Catalyst nanoparticles are prepared via coating preformed 80 nm Fe2O3 particles with a 15 nm SiO2 protective coating prior to growth of a uniform 28 nm ZrO2 shell. The thickness of the ZrO2 shell in resulting Fe3O4@SiO2@ZrO2 nanoparticles was controlled by adjusting the zirconium butoxide to Lutensol AO5 ratio, with 1:10 found as the optimal ratio to produce monodispersed ZrO2 coated nano-spheres. Sulfation using an ammonium sulfate precursor is less corrosive towards the core-shell structure of Fe3O4@SiO2@ZrO2 nanoparticles leading to superior sulfated materials compared to those obtained using H2SO4. Resulting Fe3O4@SiO2@SO4-ZrO2 solid acid catalysts exhibit high activity for propanoic acid esterification with methanol, far exceeding that of conventional sulfated zirconia nanoparticles, while being amenable to facile magnetic separation.



中文翻译:

用于丙酸酯化的磁性可分离Fe 3 O 4 @SiO 2 @SO 4 -ZrO 2核壳纳米粒子催化剂

合成了单分散,硫酸化氧化锆包裹的磁铁矿纳米颗粒,作为磁性可分离的固体酸催化剂。在均匀的28 nm ZrO 2壳生长之前,先用15 nm SiO 2保护涂层涂覆预先形成的80 nm Fe 2 O 3颗粒,制备催化剂纳米颗粒。通过调节丁酸锆与Lutensol AO5的比例来控制所得Fe 3 O 4 @SiO 2 @ZrO 2纳米颗粒中ZrO 2壳的厚度,发现最佳比例为1:10以生产单分散的ZrO 2涂层的纳米球。与使用H 2 SO 4获得的材料相比,使用硫酸铵前体进行的硫酸盐对Fe 3 O 4 @SiO 2 @ZrO 2纳米颗粒的核-壳结构的腐蚀性较小。所得的Fe 3 O 4 @SiO 2 @SO 4 -ZrO 2固体酸催化剂显示出用甲醇进行丙酸酯化的高活性,远超过常规硫酸化氧化锆纳米颗粒的活性,同时易于磁分离。

更新日期:2018-03-20
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