Publications

Data publikacji: 2024-07-16

In-situ exploration of divergent methane coupling pathways in dry and aqueous environments on silver and palladium heteropolyacid-titania photocatalysts

Yinghao Wang, Chunyang Dong, Di Hu, Renata Tokarz-Sobieraj, Dorota Rutkowska-Zbik, Karima Ben Tayeb, Ahmed Addad, Vladislav Butenko, Ernesto de la Torre Miranda, My Nghe Tran, Pardis Simon, Olga Safonova, Valerie Briois, Vitaly V. Ordomsky, Andrei Y. Khodakov

Applied Catalysis B: Environment and Energy 358 (2024-07-16) 124400
https://doi.org/10.1016/j.apcatb.2024.124400
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Abstrakt

Methane, abundant but inert, contributes significantly to greenhouse gases, primarily through combustion, which emits vast amounts of CO2. Photocatalytic methane coupling at ambient temperature offers a method to convert it into ethane, a more versatile hydrocarbon. This study examines selective methane-to-ethane coupling using heterogeneous photocatalysts comprising silver and palladium salts dispersed on titania. Through a combination of ex-situ and in-situ techniques along with DFT simulations, distinct mechanisms and active phases in these catalysts are revealed. In silver catalysts, dispersed cationic Ag+ species are crucial for methane activation, while in palladium catalysts, palladium primarily exists in metallic form during coupling. Water strongly enhances coupling rates with both catalysts. DFT modeling identified methane adsorption sites, suggesting methane activation via •OH radicals, experimentally supported by EPR under in-situ conditions.

Lista publikacji

Lista publikacji

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