fulltext.study @t Gmail

Preparation, characterisation and catalytic evaluation of MgF2 supported V2O5 catalysts for ammoxidation of 3-picoline

Paper ID Volume ID Publish Year Pages File Format Full-Text
43173 45957 2009 11 PDF Available
Title
Preparation, characterisation and catalytic evaluation of MgF2 supported V2O5 catalysts for ammoxidation of 3-picoline
Abstract

Non-conventional MgF2 supported V2O5 catalysts with different vanadia contents (2–15 wt.%) were prepared by impregnation (using NH4VO3), characterised and catalytically evaluated for selective ammoxidation of 3-picoline to nicotinonitrile. Oxygen and ammonia chemisorption uptakes increased continuously from 60 to over 600 μmol g−1 and 275 to >750 μmol g−1, respectively, with rise in V2O5 proportion indicating that the redox as well as acidic sites are increasing with increase in V2O5 content. Thermo gravimetric analysis (TGA) and differential thermal analysis (DTA) analysis revealed endothermic as well as exothermic thermal effects mainly due to liberation of water and ammonia, and also due to structural changes. XRD patterns showed the formation of crystalline V2O5 in the fresh solids having 8 wt.% V2O5 and above and NH4VO3 phase in the spent samples. The conversion of 3-picoline is observed to increase continuously with increase in V2O5 loading. However, the selectivity of nicotinonitrile is found to be independent on conversion of 3-picoline. The catalyst with the highest V2O5 loading (15.7 wt.%) displayed the best activity (X > 90%) and selectivity (S > 95%) compared to all other catalysts of this series. The 3-picoline conversion of 10% at 548 K is increased to almost 100% with rise in temperature to 663 K. Increase in 3-picoline feed rate and NH3: 3-picoline ratio exhibited an inhibiting effect on the conversion, while an increase in air: 3-picoline ratio has no significant influence on the performance.

Graphical abstractHighly active and selective V2O5/MgF2 catalysts were synthesized, characterised and evaluated for ammoxidation of 3-picoline. These solids displayed high conversion of 3-picoline (ca. 90%) and higher yield of nicotinonitrile (ca. 95%).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Ammoxidation; 3-Picoline; Nicotinonitrile; V2O5/MgF2 catalysts; Influence of reaction parameters
First Page Preview
Preparation, characterisation and catalytic evaluation of MgF2 supported V2O5 catalysts for ammoxidation of 3-picoline
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 352, Issues 1–2, 15 January 2009, Pages 223–233
Authors
, , , ,
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