Structural and Electro-chemical Properties of Double Perovskites Based on Rare EarthElements (Ce/La) and Transition Metals (Fe, Cu, and Zn)

A۱-xA’xB۱-yB’yO۶ (A: Ce, La & B: Fe, Cu, Zn) perovskite-type mixed oxides were synthesized by the sol–gelmethod. The characterization results indicate that the main effects of the partial substitution of B-metal with Znelements are the maintenance of the hexagonal structure of the perovskite and the increase in reducibility andoxygen mobility. All structures was optimized and computational electro-chemical properties was reported.Based on these results, changing the chemical composition of perovskites has a significant effect on theirelectronic properties and it is expected to be effective in their efficiency to convert CO, NO and NO۲ pollutinggases. La۰.۵Ce۰.۵Fe۰.۴Cu۰.۴Zn۰.۲O۳ is the most active catalyst for improving CO and UHC oxidation, as it is the mostreducible, and because is able to evolve oxygen at intermediate temperatures. La۰.۵Ce۰.۵Fe۰.۳Cu۰.۳Zn۰.۴O۳ is themost active catalyst for NOx reduction.

کلیدواژه ها:

Perovskite mixed oxides ، Ce/La rare earths ، Fe/Cu/Zn transition metals ، Sol-gel