Abstract
Iron supported bentonite clay catalysts have been prepared by the ion exchange of bentonite with iron2+ and iron3+ solution and immobilization with iron compounds using ligands: acetylacetonate, picolinate, pyrazinate and bipyridine. The catalysts were characterized by FT-IR spectroscopy, X-ray diffraction, X-ray fluorescence analysis and scanning electron microscopy. They were used as catalyst in the oxidation reaction of cyclooctane with tert-butyl hydroperoxide as oxidant. The experimental results show that activity of the catalysts is influenced by ligand, it decreases in the following order: acetylacetonate > picolinate > pyrazinate ∼ bipyridine. Bentonite supported with iron3+ acetylacetonate gave 17% yield with 80% selectivity to cyclooctanone at 70°C for 24 h. The mechanism of the cyclooctane oxidation with tert-butyl hydroperoxide was proposed to occur via alkyl hydroperoxide intermediate in radical pathway.
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Trakarnpruk, W., Dumrongpong, P. Iron supported clay as catalysts for oxidation of cyclooctane. J Mater Sci 41, 3001–3006 (2006). https://doi.org/10.1007/s10853-006-6767-5
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DOI: https://doi.org/10.1007/s10853-006-6767-5