Journal article
Sulfur poisoning of molybdenum dioxide during the partial oxidation of a Jet-A fuel surrogate
Applied catalysis. B, Environmental, Vol.105(1), pp.61-68
2011
Handle:
https://hdl.handle.net/2376/106821
Abstract
[Display omitted]
► Influence of sulfur compounds on MoO
2 under partial oxidation of dodecane studied. ► MoO
2 displays stable performance at benzothiophene concentrations of 1000
ppmw. ► TEM and XPS show the deactivation process of MoO
2 under 5
wt% benzothiophene. ► Formation of surface MoS
2 promotes coke formation under 5
wt% benzothiophene.
The aim of the present work is to investigate the effect that organic sulfur compounds have on the catalytic performance of molybdenum dioxide (MoO
2) during the partial oxidation reaction of aviation fuels. N-dodecane and benzothiophene were used as surrogates for Jet-A fuel and as a model sulfur compound, respectively. Activity tests of commercial MoO
2 toward the partial oxidation reaction of this model Jet-A fuel were performed at 850
°C. Our studies indicate that MoO
2 displays a remarkable tolerance to deactivation by organic sulfur compounds even at concentrations as high as 1000
ppmw, a typical sulfur concentration found in aviation fuels. However, commercial MoO
2 catalysts show a significant catalytic performance deactivation as the concentration of organic sulfur compounds increases to 3000
ppmw. TEM and XPS data indicate that the deactivation process starts with the formation of Mo sulfide on the catalyst surface. The sulfide phase appears to reduce the ability of the catalyst to activate hydrocarbon molecules as well as impeding the ability to deliver lattice oxygen to the active surface sites, which leads to the enhancement of side reactions that promote the formation of coking. The catalyst deactivation resulting from the exposure to such high concentrations of organic sulfur compounds appears to be reversible with an air treatment at 850
°C. The catalyst activity of MoO
2 recovers approximately 80% of its initial performance as demonstrated by the H
2 yield and TEM data.
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Details
- Title
- Sulfur poisoning of molybdenum dioxide during the partial oxidation of a Jet-A fuel surrogate
- Creators
- Oscar Marin-Flores - Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 642710, Pullman, WA 99164-2710, USATimothy Turba - School of Mechanical and Materials Engineering, Washington State University, P.O. Box 642920, Pullman, WA 99164-2920, USACaleb Ellefson - School of Mechanical and Materials Engineering, Washington State University, P.O. Box 642920, Pullman, WA 99164-2920, USALouis Scudiero - Department of Chemistry, Washington State University, P.O. Box 642920, Pullman, WA 99164-2920, USAJoe Breit - System Concept Center, Boeing Commercial Airplanes, 6600 Merrill Creek Pkwy., Everett, WA 98203, USAM. Grant Norton - School of Mechanical and Materials Engineering, Washington State University, P.O. Box 642920, Pullman, WA 99164-2920, USASu Ha - Voiland School of Chemical Engineering and Bioengineering, Washington State University, P.O. Box 642710, Pullman, WA 99164-2710, USA
- Publication Details
- Applied catalysis. B, Environmental, Vol.105(1), pp.61-68
- Academic Unit
- Mechanical and Materials Engineering, School of; Chemistry, Department of; Chemical Engineering and Bioengineering, School of
- Publisher
- Elsevier B.V
- Identifiers
- 99900547069501842
- Language
- English
- Resource Type
- Journal article