(544dz) Modeling the Kinetics of Ethane Oxidative Dehydrogenation Via Chemical Looping
Mn-based oxides have been shown to be effective as redox catalysts for the ODH of ethane . Process modeling with ASPEN Plus® show that CL-ODH with 85% ethane conversion provides over 80% reduction in the overall energy demand with similar reduction in the overall CO2 emissions . In this work, existing kinetic models for ethane thermal cracking are tested and validated using CHEMKIN-PRO first. Selective combustion of hydrogen to water, over the redox catalyst, shifts the equilibrium towards ethylene and partially provides the heat required for the cracking reaction. In the latter part of this work, the hydrogen-consumption, occurring due to the presence of the oxide, is incorporated into the gas-phase cracking scheme. This addition is in the form of surface kinetics of the redox catalyst towards hydrogen combustion, which are experimentally obtained. Results from the kinetic model are compared with experimental observations from a lab scale reactor. The kinetic model, which couples ethane cracking with hydrogen combustion would aid in optimizing the redox catalyst and process conditions for ethylene production via CL-ODH.
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