Room temperature epoxidation of ethylene over delafossite-based AgNiO nanoparticles.

A mixed oxide of silver and nickel AgNiO was obtained co-precipitation in alkaline medium. This oxide demonstrates room temperature activity in the reaction of ethylene epoxidation with a high selectivity (up to 70%). Using the PDF method, it was found that the initial structure of AgNiO contains stacking faults and silver vacancies, which cause the nonstoichiometry of the oxide (Ag/Ni < 1).

Mixed silver-nickel oxide AgNiO: Probing by CO during XPS study.

In this work, the reaction properties of mixed silver-nickel oxide AgNiO were investigated in the reaction of CO oxidation ranging from room temperature up to 350 °C. X-ray photoelectron spectroscopy revealed the presence of a single oxidized silver state and the combination of Ni and Ni species on the surface of the as-prepared mixed oxide. It was established that AgNiO was able to interact with CO at room temperature.