Revealing Active Sites and Redox Dynamics in High-Entropy Oxide Catalysts for Ethanol Steam Reforming (2026)
Abstract
This proposal aims to elucidate the atomic-level structure and redox behavior of an exceptional high-entropy oxide (HEO) catalyst, NiCoMnMg0.1AlO?, developed for ethanol steam reforming. This spinel catalyst achieves 89% hydrogen yield with 100% ethanol conversion at 650 °C with excellent stability and anti-coking over 20 h. Preliminary data suggest dispersed Ni, Co, and Mn in the HEO matrix and high oxygen vacancies drive its performance. However, direct evidence of active sites, oxidation states, alloying, and oxygen coordination is lacking. We propose XAS at the Ni, Co, and Mn K-edges on the MEX-1 beamline to track redox and local environments.
