The octahedral family of NiO nanoparticles is gaining significant attention as an assembly with unique physicochemical properties and outcomes in electromagnetics, shielding, and absorption. In this study, a mesoporous structured Ni60%SiO2(Comm), chosen owing to its NiO species existing in an octahedral shape, was evaluated for synthesis gas (syngas: H2(g) and CO(g) mixtures) production via combined steam and dry reforming of a model biogas mixture (T= 800 °C, (H2O(g) + CO2(g))/CH4(g)= 1.2). To the best of our knowledge, the consideration of Ni octahedra-based nanomaterials as potential catalysts for reforming reactions, particularly biogas reforming, towards syngas generation has not been yet considered in the available literature. In comparison to a standard Ni5%SiO2 catalyst, slightly higher reactivity levels along with significantly lower amounts of carbonaceous deposits were obtained over the commercial Ni60%SiO2(Comm) catalyst for 10 h on stream. The high coke resistance of originally shaped NiO octahedra was ascribed to an annealing effect, generated during H2(g)-treatment (prior to catalysis), yielding mesoporous metallic Ni0 nanorods with H2(g)-storage capacities. Stored hydrogen within Ni0 layers acted as active centers for continuous in situ coke gasification, preventing thus C(s) accumulation while keeping Ni0 sites accessible for catalysis.
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The annealing effect of structured nickel octahedra nanoparticles on the performance of NiO supported on silica in combined steam and dry reforming of a model biogas mixture
Published: 05 May 2023 by MDPI in The 4th International Online Conference on Nanomaterials session Nanotechnology for Catalysis, Electrochemistry, Energy, and Environment
https://doi.org/10.3390/IOCN2023-14465 (registering DOI)
Keywords: Octahedral nanoparticles; Biogas reforming; Annealing effect; Carbon gasification