Influence of Additives to V₂O₅ on the Rate of 1‐Butene Oxidation

Abstract

The deviation from stoichiometric composition of V2O5 due to doping with Al3+ and W6+ ions in the range of concentration of 0.001 to 0.01 mol was studied. The change of excess electron concentration caused by doping was small as can be concluded from electrical measurements. The electric microbalance results show a higher deviation from stoichiometry by Al3+ ion doping where the catalyst composition reached V2O4.01 structure compared with V2O4.7 for V2O5 doped with W6+ ions. In general, the nature of the surface as well as the catalyst bulk properties were affected even by small additions of foreign cations. These effects on the oxidative dehydrogenation of 1‐butene were studied in a microflow reactor. An oxidation mechanism was proposed, where the oxygen exchange seems to be rate‐determining while all electronic steps are fast.