Thermodynamic and experimental study of the partial oxidation of a Jet A fuel surrogate over molybdenum dioxide

A combination of thermodynamic calculations and experimental results was used to investigate the activity and stability of molybdenum dioxide (MoO2) as a catalyst for the partial oxidation of aviation jet fuels. The surrogate fuel used in this study was n-dodecane. Our results indicate that the stability window for MoO2 is strongly affected by the O-2/C molar ratio. Thus, the formation of elemental carbon on the catalyst structure can be prevented using O-2/C ratios higher than 0.5. However, O-2/C ratios higher than 1.0 enhance the formation of MoO3, which is volatile and leads to the irreversible loss of catalytic material. The activity was measured at 850 degrees C and 1 atm and our findings indicate that, within the stability window determined earlier, the production rates of H-2 and CO can reach values as high as 78% and 92%, respectively. The coking resistance of MoO2 was compared with that of a commercial nickel catalyst by performing activity tests under coke-promoting conditions. Energy dispersive X-ray analysis of the spent samples shows that MoO2 is much more resistant to deactivation by coking than the commercial nickel catalyst. Based on these results, MoO2 appears to be a promising catalyst for the partial oxidation of jet fuels. (C) 2010 Elsevier B.V. All rights reserved.