Kinetic investigation of propane oxidation on diluted Mo1-V 0.3-Te0.23-Nb0.125-O x mixed-oxide catalysts

Abstract

Reaction kinetics and proposed mechanism for the oxidation of propane over diluted Mo1-V0.3-Te0.23-Nb0.125-O x are described. The kinetic study allowed determination of the orders of propane disappearance, propene formation, CO x formation, and acids formation. The results show that selective oxidation of propane to propylene over this catalyst follows the Langmuir-Hinshelwood mechanism. Deep oxidation of propane to carbon dioxide is first order with respect to hydrocarbon, and partial order (0.21) with respect to oxygen. The selective oxidation of propane to acrylic acid is half order with respect to hydrocarbon and partial order (0.11) with respect to oxygen, while water does not participate directly in propane transformation. The result also shows that the overall reaction consists of three parallel process channels. One main sequence of consecutive reactions leads to the desired product. © 2009 Akadémiai Kiadó, Budapest, Hungary.