High Entropy Alloys (HEAs) As Catalysts for NOx Reduction: Catalytic Activity and Stability in Pollution Control.

The abatement of NOx, NH3, and volatile organic compounds (VOCs) from exhaust gases is crucial for minimizing air pollution, particularly in denitration offgas systems. This research explores the use of High Entropy Alloys (HEAs) as catalysts for the reduction of NOx to nitrogen (N₂) and water in the presence of ammonia (NH₃). HEAs, known for their enhanced catalytic activity, thermal stability, and customizable compositions, were synthesized using stock solutions of Ce³⁺, Fe³⁺, Pd²⁺, Pt⁴⁺, and V³⁺. Two preparation methods—drop casting and direct mixing with graphene oxide films—were employed, followed by microwave heating. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) analyses revealed the composition and structure of the HEA films. Future work aims to test new alloy compositions and optimize catalytic performance for environmental applications.