Tailored Redox Catalysts for Methane Partial Oxidation

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Methane is commercially used as a feedstock for producing hydrogen and liquid transportation fuels via reforming processes. Although a large number of reforming catalysts have been investigated and commercially utilized , deactivation of reforming catalysts remains as a challenge for the development of more effective catalysts. In the current study , we report a “core-shell” redox catalyst that is both an active reforming catalyst and an effective lattice oxygen (O2-) donor for methane reforming. Compared to the conventional reforming processes , the proposed redox catalyst is potentially beneficial since the embedded O2- allows effective oxidation of methane without the presence of external oxidants such as steam or oxygen , avoiding the energy intensive air separation step. The active O2- also inhibits coke formation , allowing a high syngas selectivity without using steam. After O2- donation , the oxygen depleted catalyst can be easily regenerated with steam and/or air. A number of redox catalysts composed of a primary metal oxide and mixed ionic-electronic conductor (MIEC) , are synthesized , characterized , and tested under redox conditions. Results indicate that the newly developed core-shell redox catalyst is significantly more selective than conventional oxygen carriers for syngas production. It also exhibits better carbon formation resistance and maintained structural/phase integrity.

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