Title : Role of Ni, La impregnation and substitution in Co3O4-ZrO2 catalysts for catalytic hydrogen combustion
Abstract:
Ni and La were substituted and impregnated on Co3O4-ZrO2 (CZ) nanocomposites by solution combustion and wetness impregnation methods for catalytic hydrogen combustion. In this study, our focus is to understand the role of active metals and their interactions with the support CZ in facilitating high oxidation rates. All the impregnated and substituted catalysts showed 100% conversion below 350 °C. The hydrogen combustion is noticeable even at 200 °C due to the activation of hydrogen and oxygen on the active sites. The Ni and La substituted with CZ catalysts showed better catalytic activity than the impregnated catalysts. To explore the mechanistic features and structure-property relations, X-ray photoelectron spectroscopy and TPR studies were carried out for substituted and impregnated catalysts. The regeneration ability was found with the Ni and La substituted catalysts and the redox coupling between Co and La/Ni indicated the possibility of a dual site redox mechanism. Overall, the lattice substitution is found to be desirable and offered high performance for catalytic H2 combustion.
Keywords: H2 combustion; H2-TPR; regeneration ability; reaction pathway; porous network structures; La substitution.
Audience Takeaway:
- This presentation helps in understanding the importance of H2 safety majorly in nuclear power plants and fuel cells.
- Mainly the people associated with designing and synthesis of new catalysts will help in understanding the importance of this work.
- This presentation will give some idea about future development of H2 safety applications.
- Catalyst regeneration ability and redox couple mechanism.
