Azancot Luque, Lola de las AguasBlay, VincentBlay Roger, José RubénBobadilla Baladrón, Luis FranciscoPenkova, Anna DimitrovaCenteno Gallego, Miguel ÁngelOdriozola Gordón, José Antonio2022-11-222022-11-222022Azancot Luque, L.d.l.A., Blay, V., Blay Roger, J.R., Bobadilla Baladrón, L.F., Penkova, A.D., Centeno Gallego, M.Á. y Odriozola Gordón, J.A. (2022). Evidence of new Ni-O-K catalytic sites with superior stability for methane dry reforming. Applied Catalysis B: Environmental, 307, 121148. https://doi.org/10.1016/j.apcatb.2022.121148.0926-33731873-3883https://hdl.handle.net/11441/139702Liquid fuels produced via Fischer-Tropsch synthesis from biomass-derived syngas constitute an attractive and sustainable energy vector for the transportation sector. This study focuses on the role of potassium as a promoter in Ni-based catalysts for reducing coke deposition during catalytic dry reforming. The study provides a new structural link between catalytic performance and physicochemical properties. We identify new Ni-O-K chemical states associated with high stability in the reforming process, evidenced by different characterization techniques. The nickel particles form a core surrounded by a Ni-O-K phase layer (Ni@Ni-O-K) during the reduction of the catalyst. This phase likely presents an alkali-nickelate-type structure, in which nickel is stabilized in oxidation state + 3. The Ni-O-K formation induces essential changes in the electronic, physical, structural, and morphological properties of the catalysts, notably enhancing their long-term stability in dry reforming. This work thus provides new directions for designing more efficient catalysts for sustainable gas-to-liquids processes.application/pdf13 p.engAttribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/Catalytic stabilityHeterogeneous catalysisMethane dry reformingNi-O-K catalytic sitesSyngasinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccesshttps://doi.org/10.1016/j.apcatb.2022.121148