Delafossite Ag2CuMnO4 is a Novel Catalytic Material for Low‐Temperature Oxidation of CO and NH3. Issue 3 (8th December 2021)

• Record Type: Journal Article
• Authors: Svintsitskiy, Dmitry A.; Sokovikov, Nikolai A.; Slavinskaya, Elena M.; Fedorova, Elizaveta A.; Boronin, Andrei I.
• Is Part Of: ChemCatChem. Volume 14:Issue 3(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-12-08
• Subjects: CO oxidation -- copper -- delafossite -- low temperature -- silver; Catalysis -- Periodicals; 541.39505
• DOI: 10.1002/cctc.202101697
• Languages: English
• ISSNs: 1867-3880

Abstract

Abstract: Ternary oxide of silver, copper, and manganese (Ag2 CuMnO4 ) 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 Ag2 CuMnO4 in oxidation reactions using molecular oxygen were investigated. High catalytic activity was found for Ag2 CuMnO4 in the CO oxidation at room temperature, while ammonia oxidation occurred above 100 °C. Ammonia oxidation resulted in the formation of N2 O/N2 or NO/NO2 products depending on the reaction temperature. As a result of the reaction exposure on Ag2 CuMnO4 during heating up to 400 °C, a modification of surface composition with preservation of the delafossite structure was found. Oxide Ag2 CuMnO4 was shown to be operating in wet CO oxidation under ambient conditions. Obtained data emphasize that Ag2 CuMnO4 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. Abstract : Delafossite‐based catalyst : Ternary oxide of silver, copper, and manganese (Ag2 CuMnO4 ) with delafossite structure was tested as a catalyst for CO and NH3 oxidation. High activity in CO oxidation was observed at room temperature, while the efficient oxidation of NH3 occurred above 100 °C. The Ag2 CuMnO4 delafossite was shown to operate in wet CO oxidation at room temperature for more than 5 h. Delafossite structure was preserved after heating in the reaction mixture up to 400 °C.