Abstract
Propane ammoxidation to acrylonitrile was studied on (VO) 2P2O 7, on vanadium—titanium mixed oxide, on vanadium—antimonate with different Sb:V atomic ratios and on iron—antimonate (Sb:Fe=2.0) catalysts. The results showed a strong deactivation effect of ammonia on propane conversion, interpreted as a competitive adsorption of ammonia on the sites for activation of propane by oxidative dehydrogenation to propylene. Selectivity to acrylonitrile behaves in a complex waywith respect to ammonia concentration showing a maximum value for an NH 3 concent around 15% followed by a decrease with a parallel increase in propylene selectivity. The effect was interpreted considering a double effect of ammonia that (i) transforms total oxidation sites to selective sites for acrylonitrile synthesis and (ii) reduces these sites due to its oxidation to nitrogen oxides. V P O and V Sb O systems show the higher selectivities in acrylonitrile formation from propane.
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