Mixed-Oxide Redox Catalysts for Shale Gas Valorization Under Cyclic Redox Schemes
In this presentation, we discuss the chemical looping schemes as potentially attractive approaches for shale gas valorization, particularly in distributed, modular applications. The chemical looping process utilizes an oxygen carrier, also known as redox catalysts, to convert shale gas components via an indirect reduction-oxidation (redox) scheme: the redox catalyst first releases its lattice oxygen to convert methane or ethane into value added products such as syngas (via methane partial oxidation) or ethylene (via ethane oxidative dehydrogenation); the oxygen depleted redox catalyst is then regenerated by reacting with a gaseous oxidant, e.g. air, steam, or CO2. A few examples of utilizing the chemical looping concept for methane partial oxidation, CO2 splitting, ethane oxidative dehydrogenation, and light alkane liquefaction are provided. Strategies to effectively design and optimize redox catalysts are also discussed.