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

Paper ID Volume ID Publish Year Pages File Format Full-Text
42023 45908 2010 8 PDF Available
Title
Thermodynamic and experimental study of the partial oxidation of a Jet A fuel surrogate over molybdenum dioxide
Abstract

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 O2/C molar ratio. Thus, the formation of elemental carbon on the catalyst structure can be prevented using O2/C ratios higher than 0.5. However, O2/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 °C and 1 atm and our findings indicate that, within the stability window determined earlier, the production rates of H2 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.

Graphical abstractThis figure describes a ternary phase diagram Mo–O–C at 850 °C and 1 atm showing the minimized Gibbs free energy in a color-scale. The results of our calculations indicate that maximum stability is attained by those regions where solid MoO2, solid Mo2C, and liquid MoO3 are present and coexist with a gas-phase consisting basically of CO2.Figure optionsDownload full-size imageDownload high-quality image (143 K)Download as PowerPoint slide

Keywords
Thermodynamic calculations; Molybdenum dioxide; Partial oxidation; Aviation jet fuels; n-dodecane; Coking resistance
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Thermodynamic and experimental study of the partial oxidation of a Jet A fuel surrogate over molybdenum dioxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 381, Issues 1–2, 15 June 2010, Pages 18–25
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us