Abstract
Abstract The effect of hydroxyl radical (⁎OH)-assisted oxidation of multiwalled carbon nanotubes (MWCNTs) as catalysts for oxidative dehydrogenation of ethylbenzene (ODEB) to styrene was studied. Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS) results indicated that the presence of hydroxyl radicals during UV/H2O2 oxidative treatment introduced significantly the amount of hydroxyl and carbonyl groups onto the surface of carbon nanotubes, leading to an improvement in the catalytic behavior. In the present work, UV/H35 MWCNTs obtained the best catalytic behavior with 91% styrene selectivity and 47% ethylbenzene conversion at 400 °C under conventional heating. Transmission electron microscopy (TEM) of UV/H35 MWCNTs showed the formation of new sp2-carbon layers on the wall of nanotubes after the stability test.
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