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چکیده
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In this work, we report the synthesis and identification of CrFe2O4@SiO2-SO3H as a novel and green nanomagnetic solid acid catalyst, which is containing the sulfuric acid catalytic sites on the surface of CrFe2O4 magnetic nanoparticles as the catalytic support. The as-synthesized CrFe2O4@SiO2-SO3H MNPs were characterized with accuracy by different physicochemical methods; including, X-ray powder diffraction (XRD), energy dispersive spectroscopy (EDS), Scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), X-ray elemental mapping, Thermogravimetric analysis (TGA), and Vibrating Sample Magnetometer (VSM) analyses. The prepared CrFe2O4@SiO2-SO3H exhibits efficient and potential performance for the esterification of oleic acid under gentle reaction conditions. The heterogeneous nature of the catalyst was confirmed via the hot filtration experiment. Furthermore, the activity of the recycled nanocatalyst was examined for at least five cycles with a negligible loss of its activity (97-92%). Also, the amount of sulfamic acid function in the CrFe2O4@SiO2-SO3H was calculated from back titration.
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