Kinetics of the oxidative dehydrogenation of propane on vanadia/titania catalysts, pure and doped with rubidium

Oxidative dehydrogenation (ODH) of propane over VTiO and VRbTiO catalysts has been studied by steady-state kinetic method in the fixed bed flow reactor. The experiments were carried out by measuring conversion and selectivities for various feed compositions including C3H8, O-2 and He, and for various contact times and temperatures. The experimental results obtained for both catalyst were described by a simple sequence of steps. Two kinetic mechanistic models: Langmuir-Hinshelwood (LH) and Eley-Rideal (ER)-Steady State Adsorption Model (SSAM) were tried and the analysis of the calculation results leads to the conclusion that Eley-Rideal-SSAM model is more appropriate for the description of the propane ODH reaction for both studied catalysts. In the frame of this latter model the role and the influence of Rb-additive on different steps of propane ODH reaction was discussed. (C) 2004 Elsevier B.V. All rights reserved.