Revolutionizing Waste Gas Valorization: Engineered CeO?-Based Catalysts for Blue Hydrogen Production Via Reverse Flow Chemical Looping

This research investigates the application of a reverse flow chemical looping process for repurposing waste gas into concentrated hydrogen and carbon dioxide streams, contributing to the development of sustainable technologies for mitigating industrial emissions. The study focuses on the synthesis and characterization of catalysts for blue hydrogen generation, with an emphasis on cerium oxide (CeO₂) as the base material.

CeO₂ was initially selected due to its excellent oxygen storage and release capabilities, attributed to its flexible Ce⁴⁺/Ce³⁺ oxidation states. However, pure CeO₂ exhibits limitations in catalytic activity and thermal stability, necessitating further modifications to enhance its performance in the valorization process.

To address these challenges, the research explores two main approaches: surface promotion and cation doping. Surface promotion involves introducing transition metal oxides onto the CeO₂ surface, creating active sites for oxidation, reduction, and reforming reactions crucial to the process. Cation doping, on the other hand, focuses on partially substituting the cerium cation with suitable metal cations to improve overall catalyst performance.

By optimizing catalyst composition and structure, this study aims to develop highly active and stable catalysts for efficient waste gas conversion into valuable hydrogen streams. The findings of this research have the potential to revolutionize various industries, promoting a transition towards a more sustainable and circular economy through the effective utilization of waste gas resources.