Abstract
The stoichiometric oxidation of ethylene by anion radicals of α-oxygen, (FeIII−O–)α, created on the surface of non-modified and Na-modified FeZSM-5 zeolite was studied in the temperature range from 25 down to −60°C. Upon extraction, the products were identified using the gas chromatography, gas chromatography–mass spectrometry, and nuclear magnetic resonance. Unlike the oxidation of methane, the reaction С2Н4+Oα was shown to proceed without hydrogen abstraction from the ethylene (infrared spectroscopy data). It leads to Oα addition over the double CC bond yielding the ethylene oxide (EO) primary product. Sodium modification of the zeolite strongly increases the selectivity for EO, which attains 80–84% at the reaction temperature of −60°C. A much lower selectivity at room temperature relates mainly to a secondary reaction of EO with ethylene leading to butyraldehyde.High epoxidizing selectivity of α-oxygen is discussed in relation to the mechanism of ethylene epoxidation on silver catalyst.
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