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Sulfur poisoning of molybdenum dioxide during the partial oxidation of a Jet-A fuel surrogate

Paper ID Volume ID Publish Year Pages File Format Full-Text
46792 46449 2011 8 PDF Available
Title
Sulfur poisoning of molybdenum dioxide during the partial oxidation of a Jet-A fuel surrogate
Abstract

The aim of the present work is to investigate the effect that organic sulfur compounds have on the catalytic performance of molybdenum dioxide (MoO2) 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 MoO2 toward the partial oxidation reaction of this model Jet-A fuel were performed at 850 °C. Our studies indicate that MoO2 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 MoO2 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 MoO2 recovers approximately 80% of its initial performance as demonstrated by the H2 yield and TEM data.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Influence of sulfur compounds on MoO2 under partial oxidation of dodecane studied. ► MoO2 displays stable performance at benzothiophene concentrations of 1000 ppmw. ► TEM and XPS show the deactivation process of MoO2 under 5 wt% benzothiophene. ► Formation of surface MoS2 promotes coke formation under 5 wt% benzothiophene.

Keywords
Molybdenum dioxide; Molybdenum sulfide; Organic sulfur compounds; Hydrogen production; Partial oxidation; Jet fuels
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Sulfur poisoning of molybdenum dioxide during the partial oxidation of a Jet-A fuel surrogate
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 105, Issues 1–2, 9 June 2011, Pages 61–68
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
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Any Questions? feel free to contact us