Dynamic Kinetic Model For Butane Selective Oxidation To Maleic Anhydride And Its Applications

One important class of hydrocarbon selective oxidation reactions over composite metal oxide catalysts proceeds according to the REDOX mechanism with the participation of lattice oxygen from the catalyst. Based on the general understanding, only surface lattice oxygen is responsible for selective reaction, while gas phase and adsorbed oxygen (mainly) provides for complete oxidation of the hydrocarbon to CO_x and H₂O.In general, oxidation processes of hydrocarbon can be made more environmentally benign by improving selectivity and decreasing the amount of byproducts and excess heat. Strategies for improving selectivity have traditionally focused on developing new catalytic materials or reducing product loss by improving heat removal. Another approach, which is employed in this dissertation, is to organize catalytic cycle effectively under unsteady state operation. That is, splitting up of the overall reaction in space or time domain to two steps, hydrocarbon selective oxidation and re-oxidation of catalyst reduced, and matching each step with suitable reaction conditions. It's significative for both economic profit and environment protection.This dissertation concerns with the reaction of n-butane selective oxidation to maleic anhydride (MA) over a VPO catalyst, as it is the only example of an industrially practiced selective oxidation reaction involving alkane activation. It is a part of the major research project, Environmental friendly petrochemical catalysis chemistry and chemical reaction engineering-Unsteady state reaction engineering for hydrocarbon selective oxidation, which is supported by the National Natural Science Foundation. Based on the investigations of reaction network structure and dynamic kinetic, a one-dimensional heterogeneous transient model of a fixed-bed...