Delafossite Ag<sub>2</sub>CuMnO<sub>4</sub> is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH<sub>3</sub>
Dmitry A. Svintsitskiy, Nikolai A. Sokovikov, Elena M. Slavinskaya, Elizaveta A. Fedorova, А. И. Боронин
Abstract
Abstract Ternary oxide of silver, copper, and manganese (Ag 2 CuMnO 4 ) was prepared by hydrothermal synthesis in an alkaline solution. The prepared sample was characterized by a delafossite crystal structure without any other crystallized phases. The catalytic properties of Ag 2 CuMnO 4 in oxidation reactions using molecular oxygen were investigated. High catalytic activity was found for Ag 2 CuMnO 4 in the CO oxidation at room temperature, while ammonia oxidation occurred above 100 °C. Ammonia oxidation resulted in the formation of N 2 O/N 2 or NO/NO 2 products depending on the reaction temperature. As a result of the reaction exposure on Ag 2 CuMnO 4 during heating up to 400 °C, a modification of surface composition with preservation of the delafossite structure was found. Oxide Ag 2 CuMnO 4 was shown to be operating in wet CO oxidation under ambient conditions. Obtained data emphasize that Ag 2 CuMnO 4 can be considered as a novel and prospective catalytic material with a high potential of application for oxidation processes at low temperatures including ambient conditions.