fulltext.study @t Gmail

Effect of oxalic acid content and medium of thermal treatment on physicochemical and catalytic properties of MoVTeNb oxide catalysts in propane ammoxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
43549 45976 2007 6 PDF Available
Title
Effect of oxalic acid content and medium of thermal treatment on physicochemical and catalytic properties of MoVTeNb oxide catalysts in propane ammoxidation
Abstract

Catalytic characteristics of MoV0.3Te0.23Nb0.12Ox catalysts in propane ammoxidation depend strongly on the quantity of oxalic acid present during slurry preparation and on the redox conditions during thermal treatment of the catalyst. Two stage thermal treatment (320 °C in air, 600 °C in He) and oxalate anion to niobium ratio in the slurry С2О42−/Nb = 3–5 have been shown to result in the catalysts with the best catalytic properties. Optimal catalysts have been found to contain M1 and M2 crystalline phases in the ratio of 3:1 or more. When the molar ratio С2О42−/Nb exceeds 3.5, tellurium is lost during calcination in He and other phases beside M1 and M2 are formed.

Graphical abstractCatalytic characteristics of MoV0.3Te0.23Nb0.12Ox catalysts in propane ammoxidation depend strongly on the quantity of oxalic acid present during slurry preparation and on the redox conditions during thermal treatment of the catalyst. Two stage thermal treatment (320 °C in air, 600 °C in He) and oxalate anion to niobium ratio in the slurry С2О42−/Nb = 3–5 have been shown to result in the catalysts with the best catalytic properties. Optimal catalysts have been found to contain M1 and M2 crystalline phases in the ratio of 3:1 or more. When the molar ratio С2О42−/Nb exceeds 3.5, tellurium is lost during calcination in He and other phases beside M1 and M2 are formed. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
MoVTeNb mixed oxide; Phase structure; M1; M2; Propane; Ammoxidation; Acrylonitrile
First Page Preview
Effect of oxalic acid content and medium of thermal treatment on physicochemical and catalytic properties of MoVTeNb oxide catalysts in propane ammoxidation
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 328, Issue 2, 10 September 2007, Pages 195–200
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