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

Durée : 00:47:59 -Réalisation : 17 juin 2021 -Mise en ligne : 17 juin 2021
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C-containingFe-, Co-, and Ni-based catalysts have been synthesized from the controlledpyrolysis of saccharose. The topological properties of the 2D materials weresignificantly different from other 2D carbon-based cell structures. TEM andSTEM showed that catalysts are composed by 1D and 2D morphologies, manly thosewith Co- and Ni, and these morphologies seems to be remaining from the pristinecarbon structures in absence of metals. Carbon seems to play a template rolefor the growing of the metal-containing structures. Electron microscopy alsoshowed that catalysts are composed by a high compaction on nanoparticles in therange 5-30 nm. XRD showed that graphite is the main crystalline phase;nevertheless, XPS showed important differences with respect to graphite. NEXAFSand RAMAN spectroscopy suggested the formation of graphene oxide. The texturalanalysis pointed out the formation of a hierarchically pore structure in thepresent materials. Fe-, Co- and Ni-doped carbon foams were studied in thethermocatalytic H2 production from dry methane reforming under softexperimental conditions. The catalytic assays demonstrated that themetal-containing carbon foams were clearly more active and suffered lessdeactivation than bulk conventional catalysts prepared by wetness impregnation.It can be concluded then that the controlled pyrolysis of saccharides opens anew, low cost and eco-friendly method for the preparation of graphene-basedfoams as catalytic membrane reactors.



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