Partial oxidation of jet fuels over Rh/Al2O3: design and reaction kinetics of sulfur-containing surrogates

Autor*innen

• Julian Nicolaas Bär

Parameter

• Lehrbücher
• Universitätslehrbücher

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The catalytic partial oxidation (CPOX) of logistic fuels on Rh/Al2O3 at short contact times effectively generates hydrogen-rich synthesis gas. This method can achieve high syngas yields and low by-product formation, making it suitable for mobile hydrogen generation, such as in aircraft to enhance fuel efficiency through fuel cell-based auxiliary power units. Jet fuels, composed of various hydrocarbons and sulfur, exhibit significant variability in composition based on their source and refinement. The effects of these compounds on syngas yield and sulfur's impact remain largely unexplored. This study investigates the influence of key jet fuel components—aromatics, alkanes, and sulfur—on syngas selectivity, catalyst deactivation, and reaction sequences. n-Dodecane and 1,2,4-trimethylbenzene were selected for ex-situ and in-situ CPOX investigations, with benzothiophene or dibenzothiophene added as sulfur components. Results indicate that higher paraffin content enhances syngas formation, while increased aromatics lead to more by-products. Sulfur alters product distribution, increasing water selectivity and reducing hydrogen selectivity, without changing the carbon-based main product distribution. Sulfur also causes an immediate decline in steam reforming reaction rates. In-situ studies confirm these findings, revealing a complex reaction network and three reaction zones, with sulfur deactivation occurring where oxygen is fully co

• Sprache: Englisch
• Erscheinungsdatum: 2016