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Monolithic supports based on biomorphic SiC for the catalytic combustion of hydrogen

AutorArzac, G.M. ; Ramírez-Rico, J.; Gutiérrez-Pardo, A.; Jiménez de Haro, M.C.; Hufschmidt, D. ; Martínez-Fernández, J.; Fernández-Camacho, A.
Fecha de publicación2016
EditorRoyal Society of Chemistry (Great Britain)
CitaciónRSC Advances, 6: 66373 (2016)
ResumenCatalytic hydrogen combustion was studied with H2/air mixtures in conditions that simulate the H2 concentration of the exhaust gases from fuel cells (3–4% v/v H2 in air). Pt-impregnated monoliths based on porous biomorphic SiC (bio-SiC) substrates were employed for the first time for this reaction. Capillary forces were exploited for the incipient impregnation of supports with H2PtCl6 solutions. Freeze drying permitted us to obtain a homogeneous distribution of the active phase reducing accumulation at the monolith's outer shell. The supports and catalysts were characterized from a structural and thermal point of view. Catalytic tests were performed in a homemade reactor fed with up to 1000 ml min 1 H2/air mixtures and a diffusional regime (non-isothermal) was achieved in the selected conditions. Catalyst loading was tested in the range of 0.25–1.5 wt% Pt and 100% conversion was achieved in all cases. Temperatures were recorded at different points of the monoliths during the reaction showing anisotropic thermal behavior for selected bio-SiC substrates. These effects are of interest for heat management applications and were explained in correlation with thermal conductivity measurements performed on the supports. Pt-impregnated monoliths were also tested in less than 100% conversion conditions (1% v/v H2 in air) and in powder form in kinetic conditions for comparative purposes
Versión del editorhttp://dx.doi.org/10.1039/c6ra09127j
URIhttp://hdl.handle.net/10261/146276
DOI10.1039/c6ra09127j
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