Activity of Oxygen on HZSM-5 Type Zeolite in Oxidation of Benzene and Its Derivatives

The oxidation of benzene, fluorobenzene, chlorobenzene, and phenol in the presence of O-2 and N2O on HZSM-5 type zeolite with Si/Al = 24 was studied by EPR spectroscopy. It was shown that the thermal decomposition of nitrous oxide on zeolite forms molecular and chemisorbed atomic oxygen. It was found that the catalytic oxidation of benzene, fluorobenzene, chlorobenzene, and phenol under the action of O-2 and N2O proceeds at Lewis acid sites and leads to the formation of phenoxyl radical cations with characteristic g factors and hyperfine structure of the EPR spectrum.