Nickel Hydroxide Polyoxometalate Composite Catalyst for High-Efficiency Direct Oxidation of Methane to C1 Oxygenates

Le résumé fourni par la source

The transformation of methane into high-value products through catalytic conversion is a vital process. However, achieving both high activity and selectivity remains a significant challenge. Herein, we present a Ni(OH) 2 -PMA catalyst, synthesized using solvothermal methods, for direct oxidation of methane to C1 oxygenates. This catalyst demonstrates remarkable activity in methane conversion. 1 H NMR results indicate that almost all liquid-phase products are the desired C1 oxygenates. When H 2 O 2 is used as the oxidant, the catalyst achieves a C1 oxygenate yield of 6.77 mmol·g cat –1 ·h –1 within 30 min at 80 °C, with an impressive selectivity of 98.44%. The catalyst shows excellent stability, maintaining activity over five cycles. The integration process of PMA with Ni(OH) 2 is revealed by characterization to produce abundant Ni-O active sites and oxygen vacancy, synergistically enhancing the ability of H 2 O 2 decomposition into reactive oxygen species (•OH/•OOH) and simultaneously promoting the C-H activation of CH 4 . Radical trapping experiments and mechanistic studies clarify the pathway of the reaction.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.