Abstract
Two pure magnesium vanadate phases, Mg 2V 2O 7 and Mg 3V 2O 8, were prepared and tested in the dehydrogenation of n-pentane in the presence of oxygen. Both magnesium vanadates are effective catalysts, with Mg 3V 2O 8 exhibiting higher selectivity to dehydrogenation products. Testing of mechanical mixtures, consisting of each one of the magnesium vanadates and antimony oxide, indicated that the latter had a positive effect especially on the selectivity to dehydrogenation with the Mg 3V 2O 8 containing samples. The main products of the reaction were pentenes, pentadienes and carbon oxides. Characterisation of the samples prior to and after catalytic tests revealed that all catalysts remained practically unchanged during the reaction. The mixtures consisted of separate magnesium vanadate and antimony oxide phases and no formation of new phases was detected.
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