Abstract
Abstract The need for environmental friendly catalysts for alkane isomerization has prompted research on the WO x /ZrO 2 system. Suitable promoters may improve its activity and stability. We investigated the effect of palladium on WO x /ZrO 2 redox properties and catalytic activity for n -butane isomerization. Pd favoured the reduction of W x O y clusters already at RT (redox cycles O 2 /H 2 ) and in reduced samples EPR identified W 5+ 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 W x O y clusters anchored to zirconia surface and interacting with near Pd hydride. For n -butane isomerization Pd-promotion is as effective as Pt-promotion.
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