Fig. 4
From: Highly efficient decomposition of ammonia using high-entropy alloy catalysts
Performance of HEA-CoxMoy catalysts for NH3 (5 vol%) decomposition. a NH3 conversions over different HEA-CoxMoy nanoparticles and bimetallic Co-Mo (Co/Mo = 25/45) depending on the reaction temperature (Space velocity = 36 L gcata−1 h−1). b Comparison of reaction rates measured in the kinetic regime among bimetallic Co-Mo, Ru, and HEA-CoxMoy catalysts (T = 500 oC). Inset: element maps for the bimetallic Co-Mo (Co/Mo = 25/45) and HEA-Co25Mo45 catalysts. c Arrhenius plots for NH3 decomposition on the HEA-CoxMoy catalysts, showing different apparent activation energies (Eapp). d, e Reaction orders of NH3 and H2 determined for the NH3 decomposition reaction at 425 oC on the HEA-CoxMoy catalysts. f Stability test performed at 500 oC for the HEA-Co25Mo45 catalyst. Inset: element map of the catalyst after the stability test; scale bar = 10 nm
