Oxidehydrogenation of propane was studied on two catalysts containing an equivalent of five theoretical monolayers of V2O5 prepared by impregnation of anatase TiO2, with ammonium metavanadate, drying and calcination. One of the catalysts was doped with potassium (K/V = 0.1). Transient kinetic experiments have been performed using concentration steps of active gases (propane and oxygen) in helium. Absence of significant mass and heat transfer effects has been verified. The experimental partial pressure curves of products have been satisfactorily simulated using a mechanism based on a proposition of Oyama. The potassium-doped catalyst could be treated within this model on the assumption that its surface was composed of modified and non-modified regions. (C); 1999 Elsevier Science Ltd. All rights reserved.