Ressource pédagogique : Juan Matos - H2 production on 1D and 2D Carbon-containing Fe-, Co, and Ni-based foamy catalysts.

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C-containing Fe-, Co-, and Ni-based catalysts have been synthesized from the controlled pyrolysis of saccharose. The topological properties of the 2D materials were significantly different from other 2D carbon-based cell structures. TEM and STEM showed that catalysts are composed by 1D and 2D morphologies, manly those with Co- and Ni, and these morphologies seems to be remaining from the pristine carbon structures in absence of metals. Carbon seems to play a template role for the growing of the metal-containing structures. Electron microscopy also showed that catalysts are composed by a high compaction on nanoparticles in the range 5-30 nm. XRD showed that graphite is the main crystalline phase; nevertheless, XPS showed important differences with respect to graphite. NEXAFS and RAMAN spectroscopy suggested the formation of graphene oxide. The textural analysis pointed out the formation of a hierarchically pore structure in the present materials. Fe-, Co- and Ni-doped carbon foams were studied in the thermocatalytic H2 production from dry methane reforming under soft experimental conditions. The catalytic assays demonstrated that the metal-containing carbon foams were clearly more active and suffered less deactivation than bulk conventional catalysts prepared by wetness impregnation. It can be concluded then that the controlled pyrolysis of saccharides opens a new, low cost and eco-friendly method for the preparation of graphene-based foams as catalytic membrane reactors.  

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