Abstract
FeMnSi composite was synthesized from a mecanosynthesis method using
SiO2 nanopowder and FeMn hydrotalcite. The composite was tested in
styrene, ethylbenzene and benzyl alcohol oxidations in the presence of
H2O2. The solid was characterized before and after the oxidation
reactions through XRD, chemical analyses, textural properties, HRTEM,
SEM-EDS, Raman and EPR measurements. Effects of catalyst mass,
substrate/H2O2 molar ratios and catalyst' recyclability were
investigated to explore the relationship between the physicochemical
properties of the solid and the catalytic performance. Results revealed
that FeMnSi catalyst exhibited much higher activity for styrene
oxidation compared with ethyl benzene and benzyl alcohol counterparts
due to Si providing a relatively stability on the Fe3+ and Mn4+/Mn3+
sites. The Si was responsible for improving the texture, structure and
morphology of the catalyst in styrene oxidation. Best reaction
conditions were achieved at temperature of 50 degrees C, H2O2 to styrene
molar ratio of 1, using 100 mg of catalyst. (C) 2017 Elsevier B.V. All
rights reserved.
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