Platinum-Catalysed Selective Aerobic Oxidation of Methane to Formaldehyde in the Presence of Liquid Water.

ABSTRACT: The aerobic, selective oxidation of methane to C₁ -oxygenates remains a challenge, due to the more facile, consecutive oxidation of formed products to CO₂ . Here, we report on the aerobic selective oxidation of methane under continuous flow conditions, over platinum-based catalysts yielding formaldehyde with a high selectivity (reaching 90 % for Pt/TiO₂ and 65 % over Pt/Al₂ O₃ ) upon co-feeding water. The presence of liquid water under reaction conditions increases the activity strongly attaining a methane conversion of 1-3 % over Pt/TiO₂ . Density-functional theory (DFT) calculations show that the preferential formation of formaldehyde is linked to the stability of the di-σ-hydroxy-methoxy species on platinum, the preferred

SUBMITTER: Mahlaba SVL 

PROVIDER: S-EPMC9541881 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature