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Alumina support-stabilized nanoscaled vanadium–phosphorous mixed oxides as new catalysts for propane ammoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41387 45887 2011 10 PDF Available
Title
Alumina support-stabilized nanoscaled vanadium–phosphorous mixed oxides as new catalysts for propane ammoxidation
Abstract

Much attention has recently been devoted to the surface of bulk catalysts. It has been proved that the most critical phenomena occur at the surface, which differs significantly from the bulk. To evaluate the role of the bulk in VPO catalyst, vanadium and phosphorus were supported on γ-alumina by incipient wetness impregnation at a total V + P of two monolayers so that nanoscaled VPO phases (n-VPO) form on alumina, such size maximizes the surface-to-bulk ratio. Alumina support stabilizes V5+, which may be reduced, while V4+ predominates in bulk vanadyl pyrophosphate phase. In addition, the support modifies acid–base and textural properties. The presence of VPO nanocrystals supported on alumina (n-VPO) facilitates investigating the interaction between alumina-dispersed vanadia and VPO-lattice vanadium ions. Both, bulk and supported phases are active for propane ammoxidation affording acrylonitrile yields of 41% and 48%, respectively, at 500 °C. The yield to acrylonitrile per mass unit of VPO increases by 150% at 500 °C in the alumina-stabilized n-VPO system when compared to the bulk VPO.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (121 K)Download as PowerPoint slideHighlights► P shifts V oxide activity from acetonitrile to acrylonitrile. ► The active phase for acrylonitrile formation appears related to V5+/V4+ redox cycle. ► Acrylonitrile yield is significantly higher per gram of supported than for bulk VPO. ► VPO catalysts exhibit higher performance than systems reported in the literature.

Keywords
Support stabilized nanoscaled VPO; Vanadium phosphates; Propane; Ammoxidation; Acrylonitrile; Alumina; Surface vanadium oxide
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Alumina support-stabilized nanoscaled vanadium–phosphorous mixed oxides as new catalysts for propane ammoxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 404, Issues 1–2, 19 September 2011, Pages 93–102
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