Chemical looping oxidative dehydrogenation (CL-ODH) utilizes a transition metal oxide based oxygen carrier, also known as redox catalyst, to convert light alkanes into olefins under a two-step cyclic redox scheme. In the first step, the redox catalyst reacts with the alkane molecule, such as ethane, to generate unsaturated hydrocarbons. Meanwhile, the hydrogen produced during olefin formation is oxidized by the lattice oxygen donated by the redox catalyst. Concurrent oxidation of the hydrogen drives the overall equilibrium towards the product side. In the second step, the lattice oxygen removed during the ODH step is replenished by contacting the redox catalyst with the air. The regeneration step also releases heat to enable authothermal operation for the process.<br/><br/>In this presentation, we present a few promising families of mixed metal oxide based redox catalysts for light alkane conversion to unsaturated hydrocarbons. The general design principles for the redox catalysts and the strategies to improve the selectivity of the redox catalyst are presented along with the underlying reaction mechanisms. Potential applications of these CL-ODH redox catalysts and schemes will be also discussed in the context of both second law analysis and detailed process modeling. Resulting from the superior performance of the redox catalysts developed and the improved energy conversion scheme, nearly an order of magnitude emission reduction can be anticipated from the CL-ODH process when compared to conventional approaches.<br/>

Chemical looping oxidative dehydrogenation for light olefin generation: Redox catalyst design and process evaluations

256th National Meeting (2018)

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