Abstract
Lacunary tungstophosphoric heteropoly compounds (HPW 11) of Keggin structure modified with transition metal ions (Fe 2+, Fe 3+ and Mn 2+) were applied as catalysts for oxydehydrogenation (ODH) of propane. The activity of iron modified HPW 11 was unstable in the reaction under investigation. High activity and selectivity for oxydehydrogenation reaction were achieved as a result of modification of heteropoly compounds with excess of manganese ions. Thermal treatment (400–500 °C) of HPW 11, modified with excess of manganese ions, resulted in the formation of a very active oxide like system. Lacunary heteropoly compounds play the role of a precursor for the formation of catalysts active for ODH. Stoichiometric HPW 11 containing Mn 2+ in the Keggin structure showed rather low activity.
Published Version
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