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Effect of Fe, Ga, Ti and Nb substitution in ≈SbVO4 for propane ammoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
41628 45895 2011 8 PDF Available
Title
Effect of Fe, Ga, Ti and Nb substitution in ≈SbVO4 for propane ammoxidation
Abstract

Substitution in rutile-type ≈SbVO4 was made with Fe3+ and Ga3+ replacing V3+, and Nb5+ replacing Sb5+. Moreover, preparations with Ti were synthesised where Ti4+ ions substitute for both V4+ and V3+/Sb5+ pairs. ≈SbVO4-related phases containing Ti together with Fe and Ga were also prepared. The samples were characterised using X-ray diffraction, DRIFT and Raman spectroscopy. The characterisations show the formation of a cation deficient single rutile-type phase. Use of the samples in propane ammoxidation to produce acrylonitrile reveals, compared with the pure ≈SbVO4 phase, that Fe, Ga and Ti substitution in ≈SbVO4 results in lower activity but considerably higher selectivity to acrylonitrile at the same level of propane conversion. Niobium substitution, on the contrary, gives no improved catalytic properties. Correlations are presented between the catalytic and structural properties of the catalysts. It is demonstrated that isolation in the structure of the propane activating V–O. sites in a surrounding of nitrogen inserting Sb-sites results in improved selectivity for acrylonitrile formation.

Graphical abstractPropane ammoxidation to acrylonitrile is studied over unsubstituted ≈SbVO4 and its substitutions with Fe, Ga, Ti and Nb. The catalytic data indicates that a catalyst selective to acrylonitrile should have structurally isolated ensembles with propane activating V-sites and nitrogen inserting Sb-sites.Figure optionsDownload full-size imageDownload high-quality image (192 K)Download as PowerPoint slide

Keywords
Propane ammoxidation; Acrylonitrile; Sb-V-oxide based catalysts; ≈SbVO4; Substitutions with Fe; Ga; Ti and Nb; XRD; DRIFT; Raman spectroscopy
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Effect of Fe, Ga, Ti and Nb substitution in ≈SbVO4 for propane ammoxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 391, Issues 1–2, 4 January 2011, Pages 110–117
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