Low-temperature oxidative coupling of methane using alkaline earth metal oxide-supported perovskites

• Published in: Catalysis today Vol. 352; pp. 127 - 133
• Main Authors: Lim, Seoyeon, Choi, Jae-Wook, Jin Suh, Dong, Lee, Ung, Song, Kwang Ho, Ha, Jeong-Myeong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.2020
• Subjects: Alkaline-earth metal oxide; Barium oxide; Low temperature; Methane; Oxidative coupling; Perovskite; Methane; Perovskite; Alkaline-earth metal oxide; Barium oxide; Oxidative coupling; Low temperature
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2019.11.014

[Display omitted] •Perovskite-supported alkaline-earth metal oxide catalysts were prepared.•These catalysts were applied in the oxidative coupling of methane.•The selective production of C2+ compounds was observed below 700 °C.•Low temperature reaction was achieved with the described oxide/support combination.•Barium oxide exhibited the highest C2+ yield at the desired temperature. Perovskite-supported alkaline-earth metal oxide catalysts were prepared for application in the oxidative coupling of methane (OCM). The selective production of C2+ compounds, including ethane, ethylene, acetylene, propane, and propylene, was observed at reaction temperatures < 700 °C. This lower reaction temperature was not achieved with pure perovskites but only with the combination of alkaline-earth metal oxides and perovskite supports. The formation of complex mixed oxides, such as Ba-Ca-Ti-Ox, Ba-Sr-Ti-Ox, and Ba2TiO4, was also observed for these catalysts. This contributed to the improved C2+ yield at the lower reaction temperature. The strong basicity, which contributes to the improved OCM activity, was also observed for these catalysts.