N₂O Assisted Ethane Transformation into Ethylene Using NiO−CeO₂−ZrO₂ Catalysts

Abstract NiO−CeO 2 and NiO−CeO 2 −ZrO 2 catalysts have been synthesized, electrochemically characterized (Mott‐Schottky (MS) measurements and Electrochemical Impedance Spectroscopy), physicochemically characterized (by N 2 adsorption, XRD, Transmission Electron Microscopy and XPS) and tested in the N 2 O assisted ethane oxydehydrogenation. The use of low Zr‐loadings (Zr/Ce=0.1 at. ratio) has led to the optimal results in the ethylene production, improving those obtained by the Zr‐free NiO−CeO 2 catalyst. However, high Zr‐loadings have meant a decrease in the olefin production. The catalytic results obtained have been explained considering the amount of oxygen vacancies, the crystalline phases formed and, especially, the nature of the surface Ni species. Importantly, the use of N 2 O as an oxidizing agent leads to a remarkable improvement in the selectivity to the olefin compared to that obtained employing molecular O 2 . Then, for a given ethane conversion the selectivity to ethylene is ca. 15 points higher using N 2 O than using O 2 . Another additional positive aspect of this NiO−CeO 2 −ZrO 2 catalyst is its high catalytic stability.