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Olefin impurity effect on n-pentane bimolecular isomerization over WOx/ZrO2

Paper ID Volume ID Publish Year Pages File Format Full-Text
50330 46790 2013 6 PDF Available
Title
Olefin impurity effect on n-pentane bimolecular isomerization over WOx/ZrO2
Abstract

Depending on the catalyst used, the reaction conditions and the molecules converted, alkane isomerization proceeds via a monomolecular or a bimolecular mechanism. n-Pentane isomerizes via both mechanisms which makes it an excellent probe molecule. In this study, n-pentane isomerization was investigated using WOx/ZrO2. Propylene and 1-pentene were co-fed separately to study the effect on n-pentane isomerization and it was identified that only 1-pentene increases the isomerization selectivity to isopentane. Our results support the model of a bimolecular mechanism that proceeds via a C10 intermediate on Zr-WOx Brønsted sites.

► Isomerization activity increases when olefins are co-fed with pentane. ► High olefin concentration increases activity but promotes coke formation. ► Propylene traces promote only the formation of isobutane and C4 olefins. ► The induction period is critical for the formation of C5+ species. ► The bimolecular isomerization mechanism over WOx/ZrO2 is the dominant pathway.

Keywords
Tungstated zirconia; Olefins; Isomerization; Acid sites; Bimolecular mechanism
First Page Preview
Olefin impurity effect on n-pentane bimolecular isomerization over WOx/ZrO2
Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 32, 5 February 2013, Pages 5–10
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis