Magnetically-separable Fe3O4@SiO2@SO4-ZrO2 core-shell nanoparticle catalysts for propanoic acid esterification

Tai, Zhijun, Isaacs, Mark, Durndell, Lee, Parlett, Christopher, Lee, Adam and Wilson, Karen (2018). Magnetically-separable Fe3O4@SiO2@SO4-ZrO2 core-shell nanoparticle catalysts for propanoic acid esterification. Molecular Catalysis, 449 , pp. 137-141.

Abstract

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.

Publication DOI: https://doi.org/10.1016/j.mcat.2018.02.021
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Engineering & Applied Sciences
Additional Information: © 2018, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
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Related URLs: https://www.sci ... 468823118300828 (Publisher URL)
Published Online Date: 2018-03-20
Authors: Tai, Zhijun
Isaacs, Mark
Durndell, Lee
Parlett, Christopher ( 0000-0002-3651-7314)
Lee, Adam
Wilson, Karen

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