Characterization of coke deposited on Pt/alumina catalyst during reforming of liquid hydrocarbons

Raman spectroscopy shows that there is no significant change in the carbon crystallite size on any of the catalysts; all are within the range of 1.45-1.83 nm. XPS analysis of carbon deposited during partial oxidation of tetradecane shows that small amounts of graphitic carbon (C/Al ratio < 0.10) remain even after treatment in oxygen for 15 min at 600 °C.