Evidence of new Ni-O-K catalytic sites with superior stability for methane dry reforming
Azancot, Lola 1Blay, Vincent 2Blay-Roger, Ruben 1Bobadilla, Luis F. 1Penkova, Anna 1Centeno, Miguel A. 1Odriozola, Jose A.1
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作者信息
1. Univ Seville
2. Lawrence Berkeley Natl Lab
折叠
Abstract
Liquid 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.
NSTL
Elsevier