MnOx promoted phase-pure M1 MoVNbTe oxide for ethane oxidative dehydrogenation

Abstract M1 phase of MoVNbTe oxide catalyst is a promising catalyst for oxidative dehydrogenation of ethane (ODHE) process. Raising V 5+ concentration in the catalyst is an effective way to improve the catalytic performance while thermal oxidation in air has limited effect on the increase of vanadium valence state. In this work, manganese is introduced into the catalyst system, acting as oxygen facilitator, making M1 oxidized by gas phase oxygen at lower temperature during the preparation process. The influence of manganese addition amount and combination method on catalyst activity is studied. BET, XPS, SEM, TEM, ICP, TPR, and TPD characterizations are performed to study the correlation between catalyst properties and catalytic performance. Corresponding to the valence state increment, the catalyst promoted by MnO x gives an improved catalytic performance, e.g. , over 20% improvement in ODHE process at 400 °C based on the ethane conversion.