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Gas-phase metathesis of 1-hexene over a WO3/SiO2 catalyst: Search for optimal reaction conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
43233 45959 2008 11 PDF Available
Title
Gas-phase metathesis of 1-hexene over a WO3/SiO2 catalyst: Search for optimal reaction conditions
Abstract

The performance of an 8 wt% WO3/SiO2 catalyst has been investigated for the metathesis of 1-hexene in a gas-phase fixed-bed reactor. The operating conditions (reaction temperature, feed composition and space time) were optimized for the yield of decene, the primary metathesis product, using a full factorial experimental design and a probabilistic two-factor search. A combined sequence of oxidative and reductive catalyst pre-treatments, followed by a nitrogen purge, led to the best yields of decene. It was found that at 380 °C, with 55 mol% 1-hexene in the feed and at 2874 g min mol−1, a decene yield of 12.8% can be obtained, with a 1-hexene conversion of 94%. Pre-treatment of the catalyst with only hydrogen and nitrogen resulted in a lower conversion of 1-hexene, selectivity and yield of primary products, possibly due to over-reduction of the active tungsten surface phase. Under the experimental conditions employed, the reaction was neither limited by extra- nor intraparticle mass transfer resistance effects.

Graphical abstractOperating conditions for the metathesis of 1-hexene over a WO3/SiO2 catalyst were optimized in terms of the yield of decene using a gas-phase fixed-bed reactor. At 380 °C, with 55 mol% 1-hexene in the feed and a space time of 2900 g min mol−1, a decene yield of 12.8% was obtained.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Metathesis; 1-Hexene; Tungsten trioxide catalyst
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Gas-phase metathesis of 1-hexene over a WO3/SiO2 catalyst: Search for optimal reaction conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 351, Issue 2, 30 December 2008, Pages 137–147
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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
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Any Questions? feel free to contact us