Preparation and application of magnetic solid acid SO42−/ZrO2/Fe3O4/WO3 for synthesis of fructone

A synthesis route to SO42−/ZrO2/Fe3O4/WO3 solid acid catalysts with magnetism is reported through chemical co-precipitation method. The obtained solid acid catalysts are characterized in detail by X-ray diffraction, Different Scanning Calorimetry (DSC), Transmission Electron Microscopy (TEM), Vibrating Sample Magnetometer (VSM), N2 adsorption–desorption, Temperature-Programmed Pesorption (TPD) of ammonia. The results show that the introduction of WO3 and Fe3O4 strongly inhibit the phase transformation of zirconia and improve the thermal stability of zirconia. Furthermore, the obtained materials present super-paramagnetism and magnetism. The super acid exhibits high catalytic activity in forming fructone by condensation.

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► Doping of WO3 and Fe3O4 delays the tetragonal-to-monoclinic phase transformation.
► The oxides improve the thermal stability and acidity of solid acid.
► The oxides inhibit the crystal growth.
► Introduction of Fe3O4 endowed solid acid with magnetism.