PII.132 Selective Fe-based catalysts to obtain nitrosobenzeno via aniline conversion in liquid phase

Resumo

Hematite (α-Fe₂O₃) e goethite (α-FeOOH) synthesized via microemulsion method were applied in liquid-phase aniline oxidation . The catalysts were characterized  by Fe⁵⁷ Mössbauer spectroscopy at 298 K, N₂ adsorption – desorption isotherms and scanning electron microscopy. Mössbauer spectra confirm the acquisition of the desired iron phases. BET data showed that GtME and HmME catalysts presented areas of 257 e 27 m².g^-1, respectively. A kinetic study was carried out and conversions of 60% and 90% of aniline were obtained for hematite e goethite, respectively, in a 24-hour reaction. Hematite presents a selectivity of 96% to nitrosobenzene, whereas goethite achieved a selectivity of 93% to azoxybenzene. Hematite presented yield of 57.6% to nitrosobenzene while  goethite showed yield of 83.7% to azoxybenzene.