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Alumina supported Mo–V–Te–O catalysts for the ammoxidation of propane to acrylonitrile

Paper ID Volume ID Publish Year Pages File Format Full-Text
43766 45987 2008 8 PDF Available
Title
Alumina supported Mo–V–Te–O catalysts for the ammoxidation of propane to acrylonitrile
Abstract

The effect of Te addition over Mo–V–O catalysts supported on alumina is discussed for the ammoxidation of propane to acrylonitrile. Catalyst composition and atmosphere of activation are evaluated. Catalysts are characterized before and after catalytic reaction by XPS, XRD and in situ Raman spectroscopies. The absence of Te in catalysts formulation and the presence of a high amount of vanadium induce the presence of V5+ species and the formation of V2O5 oxide; associated with a decrease in acrylonitrile selectivity. The presence of Mo-based polyacids structures decreases the selectivity to acrylonitrile. V5+ sites are responsible of propane activation and of the subsequent α-H abstraction to form the intermediate propylene. Then, a Mo–V rutile-like structure in which vanadium species are reduced as V4+, is responsible for nitrogen insertion and acrylonitrile formation. The formation of such structure is favoured when Te is added to catalysts and is promoted during propane ammoxidation.

Graphical abstractThe effect of Te addition over Mo–V–O catalysts is discussed for the ammoxidation of propane. V5+ sites are responsible of propane activation and of the subsequent α-H abstraction to form the intermediate propylene. A Mo–V structure in which vanadium is reduced, is responsible for nitrogen insertion and acrylonitrile formation. The formation of such structure is favoured when Te is added.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
V–Mo–O; V–Mo–Te–O; V–Mo–Al–O; V–Mo–Te–Al–O; Ammoxidation; Structure–activity relationship; In situ Raman; XRD; XPS
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Alumina supported Mo–V–Te–O catalysts for the ammoxidation of propane to acrylonitrile
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 341, Issues 1–2, 15 June 2008, Pages 119–126
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