Hydrogen production by ethanol steam reforming over Cu–Ni supported catalysts

Abstract

In the present work, Cu–Ni supported catalysts were tested in ethanol steam reforming reaction. Two commercial amorphous solids ( SiO 2 and γ - Al 2 O 3 ) and three synthesized materials (MCM-41, SBA-15 and ZSM-5 nanocrystalline) were used as support. A series of Cu–Ni/ SiO 2 catalysts with different Cu and Ni content were also prepared. It was found that aluminium containing supports favour ethanol dehydration to ethylene in the acid sites, which in turn, promotes the coke deactivation process. The highest hydrogen selectivity is achieved with the Cu–Ni/SBA-15 catalyst, due to a smaller metallic crystallite size. Nevertheless, the Cu–Ni/ SiO 2 catalyst showed the best catalytic performance, since a better equilibrium between high hydrogen selectivity and CO 2 / CO x ratio is obtained. It was seen that nickel is the phase responsible for hydrogen production in a greater grade, although both CO production and coke deposition are decreased when copper is added to the catalyst.