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Investigation of the nature of V-species on alumina modified by alkali cations: Development of multi-functional DeSOx catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
40744 45864 2012 8 PDF Available
Title
Investigation of the nature of V-species on alumina modified by alkali cations: Development of multi-functional DeSOx catalysts
Abstract

The location of vanadium species on δ-aluminas modified by lithium, sodium or potassium has been thoroughly investigated by means of several techniques. XRD, TPR and textural analyses showed that vanadium species are preferentially located on group I element or in its close vicinity when compared with the non-modified alumina.Vanadium species are localized nearby lithium and potassium cations, whilst vanadium species are partially distributed between sodium and alumina support in the sodium-modified alumina. A detailed XPS study was also carried out over potassium-promoted alumina catalysts and confirmed the vanadium distribution nearby potassium.Experiments of SOx capture and sulfate reduction to H2S were performed under realistic Fluid Catalytic Cracking (FCC) conditions with respect to the temperature of the catalyst regeneration (at 725 °C) and during hydrocarbon reactions (around 575 °C).Among different alkali cation modifiers, alumina modified by potassium exhibited the best performance in the DeSOx reaction (in terms of mole of absorbed sulfur per mole of group I cation) according to the following ratios: 0.74, 0.34 and 0.24 observed for K, Li and Na, respectively.Finally, vanadium largely improved the rate of SO2 oxidation as well as the rate of sulfate reduction to H2S.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (266 K)Download as PowerPoint slideHighlights► Vanadium was introduced onto δ-aluminas modified by lithium, sodium or potassium. ► Vanadium species are preferentially located on group I element compared with the alumina surface. ► Vanadium largely improved the rate of SO2 oxidation as well as the rate of sulfate reduction to H2S. ► The reduction of the formed sulfate to H2S was remarkably affected by the V–K proximity. ► Alumina modified by potassium exhibited the best DeSOx performance.

Keywords
DeSOx; FCC; Vanadium; Alumina
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Investigation of the nature of V-species on alumina modified by alkali cations: Development of multi-functional DeSOx catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 449, 27 December 2012, Pages 23–30
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
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Full-text PDF Download
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