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Catalytic hydrogen combustion was studied with H2/air mixtures in conditions that simulate the H2\udconcentration of the exhaust gases from fuel cells (3–4% v/v H2 in air). Pt-impregnated monoliths\udbased on porous biomorphic SiC (bio-SiC) substrates were employed for the first time for this\udreaction. Capillary forces were exploited for the incipient impregnation of supports with H2PtCl6\udsolutions. Freeze drying permitted us to obtain a homogeneous distribution of the active phase\udreducing accumulation at the monolith's outer shell. The supports and catalysts were characterized\udfrom a structural and thermal point of view. Catalytic tests were performed in a homemade reactor\udfed with up to 1000 ml min 1 H2/air mixtures and a diffusional regime (non-isothermal) was achieved\udin the selected conditions. Catalyst loading was tested in the range of 0.25–1.5 wt% Pt and 100%\udconversion was achieved in all cases. Temperatures were recorded at different points of the monoliths\udduring the reaction showing anisotropic thermal behavior for selected bio-SiC substrates. These\udeffects are of interest for heat management applications and were explained in correlation with\udthermal conductivity measurements performed on the supports. Pt-impregnated monoliths were also\udtested in less than 100% conversion conditions (1% v/v H2 in air) and in powder form in kinetic\udconditions for comparative purposesPeer reviewe

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