fulltext.study @t Gmail

Vanadium species and their effect on the catalytic behavior of an FCC catalyst

Paper ID Volume ID Publish Year Pages File Format Full-Text
44201 46007 2006 7 PDF Available
Title
Vanadium species and their effect on the catalytic behavior of an FCC catalyst
Abstract

Samples of a commercial FCC catalyst impregnated with 3000 ppm vanadium and subjected to oxidative and reductive treatments, were characterized by electron spin resonance (ESR) and tested in a microactivity test (MAT) to study the effect of different oxidation states of vanadium on the catalytic behavior when processing an atmospheric residue from the North Sea. MAT testing at 524 °C shows that samples containing a substantial part of V4+ combined with a strong part of V3+ or lower oxidation states give a considerably less catalytic effect of vanadium than samples containing mainly V5+. The test results indicate that V4+ and V5+ have quite similar dehydrogenation activities, while V3+ or lower oxidation states have almost no dehydrogenation effect. It has been found that different oxidation states of vanadium (V3+ or lower, V4+ and V5+) co-exist when treating the catalyst samples in 5% hydrogen in nitrogen at elevated temperatures up to 760 °C. The initial conversion to V3+ or lower oxidation states occurs no later than after only one-third of the vanadium is converted from V5+ to V4+. A relatively higher concentration of V4+ is allowed when treating the catalyst in 5% carbon monoxide in nitrogen.

Keywords
FCC; Vanadium; Dehydrogenation; MAT; ESR; Resid cracking
First Page Preview
Vanadium species and their effect on the catalytic behavior of an FCC catalyst
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 299, 17 January 2006, Pages 243–249
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