Highlights: Co nanoparticles are stabilized against sintering in the mesopores of SBA-15 during dry methane reforming. The decrease of reduction temperature in presence of Rh leads to more numerous Co species confined in the pores. Deactivating carbons are formed in lower amount in presence of both rhodium and cobalt.
An ordered mesoporous "one-pot" nickel-alumina catalyst (5 wt% Ni) was synthesized using the evaporation-induced selfassembly method. Compared to an impregnated and to a non-porous catalysts, the ordered "one-pot" Ni-alumina sample displayed, after in-situ reduction, the highest and the most stable catalytic performances along 40h of run at 800°C in combined steam and dry reforming of methane, with conversion and selectivity values close to the thermodynamic expected-ones. Both the confinement of well-dispersed Ni-nanoparticles within the structured Al2O3 framework and the strengthened Ni-support interaction compared to other catalysts are shown to be key factors accounting for the high catalytic activity and stability. Contrarily to alumina that appears as an effective support of Ni for catalytic combined methane reforming, neither mesoporous (SBA-15) nor macroporous (CeliteS, diatoms) silica are appropriate ones due to rapid deactivation by partial reoxidation of the metallic Ni 0 active phase in the conditions of reaction.
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