Engineering heterojunction noble metal (NM)@ZnO catalyst for improved CH4 photocatalytic oxidation

초록

The photo-oxidation of methane into value-oxygenated products using H2O2 and H2O as an oxidant under atmospheric pressure represents a desired sustainable strategy for the production of commodity chemicals. However, controlling the products and maintaining high yields poses significant challenges. In this study, we propose an efficient strategy involving the design of noble metal (Au, Pd)/ZnO photocatalysts to enhance the productivity of oxygenates through CH4 photocatalytic oxidation. The prominent product, CH3OH, is achieved with a high yield of 1900 μmol/g. The unique combination and porous structures of Au/ZnO synergistically promote its conversion performance. Additionally, photoluminescence results provide direct evidence of the main intermediates involved in producing CH3OH and multi-carbon oxygenates. The findings of this research offer valuable insights into the fundamental oxidation mechanisms underlying photocatalytic CH4 conversion. © 2024 Elsevier B.V.

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