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Pd-promoted WOx/ZrO2 catalysts: Characterization and catalytic activity for n-butane isomerization

Paper ID Volume ID Publish Year Pages File Format Full-Text
42625 45934 2008 7 PDF Available
Title
Pd-promoted WOx/ZrO2 catalysts: Characterization and catalytic activity for n-butane isomerization
Abstract

The need for environmental friendly catalysts for alkane isomerization has prompted research on the WOx/ZrO2 system. Suitable promoters may improve its activity and stability. We investigated the effect of palladium on WOx/ZrO2 redox properties and catalytic activity for n-butane isomerization. Pd favoured the reduction of WxOy clusters already at RT (redox cycles O2/H2) and in reduced samples EPR identified W5+ surface species.Increasing Pd dispersion increased the catalytic activity. Leached and pre-reduced catalysts resulted to have the highest activity, suggesting that the most active species are WxOy clusters anchored to zirconia surface and interacting with near Pd hydride. For n-butane isomerization Pd-promotion is as effective as Pt-promotion.

Graphical abstractWe investigated the palladium effect on WOx/ZrO2 redox properties and catalytic activity for n-butane isomerization. Pd favoured the reduction of WxOy already at RT and in reduced samples EPR identified three W5+ surface species. Leached and pre-reduced catalysts showed the highest activity, suggesting that the most active species are WxOy clusters anchored to zirconia surface and interacting with near Pd hydride.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Pd-promoted tungstated zirconia; n-Butane isomerization; Pd–WOx/ZrO2 redox properties; EPR spectroscopy
First Page Preview
Pd-promoted WOx/ZrO2 catalysts: Characterization and catalytic activity for n-butane isomerization
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 351, Issue 1, 15 December 2008, Pages 29–35
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis