Isomerization of olefins on Ta2O5 catalysts

The double bond and skeletal isomerization of olefins was investigated on Ta₂O₅ catalysts calcined at different temperatures. A remarkable minimum of catalytic activity and surface acidity (as characterized by pyridine adsorption) was found at 600°C calcination temperature. A further peculiarity of Ta₂O₅ catalyts was found in the exceptionally low surface OH coverage (0.01–0.3 OH nm^–2). Pyridine is a total poison, water is a partial poison, whereas CO₂ has no effect on the catalytic activity.

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Ta₂O₅, . ( ) 600°C. Ta₂O₅ OH (0,01–0,3 OH nm^–2). , CO₂ - .