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Coke formation on WO3/SiO2 metathesis catalysts

Paper ID Volume ID Publish Year Pages File Format Full-Text
44078 46002 2007 5 PDF Available
Title
Coke formation on WO3/SiO2 metathesis catalysts
Abstract

An appreciable amount of coke forms over an 8 wt% WO3/SiO2 during the metathesis of 1-alkenes to internal alkenes. Catalyst activity is maintained despite the high coke levels (49 wt%). To understand this phenomenon, the coked catalyst was characterized by thermogravimetric analysis (TGA), BET and energy filtered transmission electron microscopy (EFTEM). Even at high coke levels, carbon maps show that the coke is dispersed over the support rather than covering the tungsten oxide. This observation may explain why the high activity of the catalyst is maintained and gives an indication that the location of coke laydown is more important than the amount deposited, in determining catalyst activity. Trace quantities of water, butanol and 2-pentanone were introduced into the feed stream and this resulted in the inhibition of coke formation without a significant loss in catalyst activity. 2-Pentanone was found to be the most effective inhibitor. Coking profiles indicated that the internal alkenes coked more rapidly than the 1-alkene feed.

Graphical abstractAn appreciable amount of coke (49 wt%) forms over an 8 wt% WO3/SiO2 catalyst during the metathesis of 1-alkenes to internal alkenes. Catalyst activity is maintained despite these high coke levels. To understand this phenomenon, the coked catalyst was characterized by energy filtered transmission electron microscopy (EFTEM). Trace amounts of oxygenated compounds were shown to dramatically reduce coke levels. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Tungsten oxide; Coke formation; Alkene metathesis; EFTEM
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Coke formation on WO3/SiO2 metathesis catalysts
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 318, 20 February 2007, Pages 155–159
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