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Application of VOx/Al2O3 and Fe2(MoO4)3–MoO3 catalysts for the selective reaction and detection of ethanol in multi-component hydrocarbon fuel mixtures

Paper ID Volume ID Publish Year Pages File Format Full-Text
47219 46464 2010 8 PDF Available
Title
Application of VOx/Al2O3 and Fe2(MoO4)3–MoO3 catalysts for the selective reaction and detection of ethanol in multi-component hydrocarbon fuel mixtures
Abstract

This work presents for the first time the development of a selective catalyst to enable selective hydrocarbon detection when coupled with a microcalorimetric sensor. Specifically, the application of VOx/Al2O3 and Fe2(MoO4)3–MoO3 catalysts as selective sensor substrates for thermal microsensor detection of ethanol in automotive fuel is described. At 453 K, 8VOx/Al2O3 (monolayer surface density of ∼8 V/nm2) and Fe2(MoO4)3–MoO3 (Mo:Fe = 1.9) catalysts convert ethanol towards one highly exothermic oxidative dehydrogenation product, acetaldehyde, with selectivities of 95% and 98%, respectively. For 8VOx/Al2O3 and Fe2(MoO4)3–MoO3, rates at 453 K are 1.3 × 10−6 and 3.4 × 10−6 mol ethanol converted/g s, respectively, and they are independent of ethanol concentration from 0.2 to 2.0 kPa ethanol. At 453 K, these catalysts provide excellent reaction selectivity towards all classes of hydrocarbons present in automotive fuels. No reaction is observed for common constituents of gasoline such as benzene, toluene, 1-pentene, 1-hexene, 2-methyl butane, butyraldehyde, and 2-methyl pentane at 453 K in binary or ternary mixtures with ethanol. All of these non-target hydrocarbons except butyraldehyde also have no impact on the ethanol partial oxidation rate or selectivity. MTBE proves to be active at 453 K over both 8VOx/Al2O3 and Fe2(MoO4)3–MoO3. Both MTBE and butyraldehyde decrease the ethanol reaction rate due to competitive surface adsorption on active sites but have no impact on the selectivity of the ethanol partial oxidation reaction.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideResearch highlights▶ Selective reaction of ethanol in typical gasoline constituents is possible. ▶ Metal oxides provide chemical specificity for electrothermal ethanol detection. ▶ Catalyst and operating temperature selection are vital for catalytic sensor design.

Keywords
Microsensor selectivity; Ethanol; Iron molybdate; Vanadium oxide; Fuel sensor
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Application of VOx/Al2O3 and Fe2(MoO4)3–MoO3 catalysts for the selective reaction and detection of ethanol in multi-component hydrocarbon fuel mixtures
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 99, Issues 1–2, 31 August 2010, Pages 127–134
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