, Volume 141, Issue 8, pp 1228-1236
Date: 10 May 2011

Hydrogen Production by Ethanol Steam Reforming on NiCuMgAl Catalysts Derived from Hydrotalcite-Like Precursors

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Abstract

Cu-promoted NiMgAl catalysts derived from hydrotalcites were synthesized by the urea hydrolysis method for ethanol steam reforming. The effect of Cu content on catalytic properties of the NiMgAl catalysts was studied. These catalysts were characterized by X-ray diffraction, thermogravimetric and differential analyses, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and temperature-programmed reduction. The addition of small amounts of Cu to NiMgAl catalysts leads to the increase of surface Ni species and the enhancement of Ni2+ reducibility. The Ni0.5Cu0.1Mg2.4Al catalyst with Cu/Ni ratio of 0.2 exhibits the higher activity and stability, showing no apparent deactivation during 20 h on stream at 700 °C, whereas Ni0.5Mg2.5Al catalyst suffers severe deactivation only after 10 h on stream. This improved performance is closely related to smaller nickel particles well dispersed on the catalyst surface. The Ni0.5Cu0.1Mg2.4Al catalyst exhibits strong resistance to coke formation and the sintering of nickel particles.

Graphical Abstract

NiMgAl and NiCuMgAl catalysts derived from hydrotalcites were synthesized by the urea hydrolysis method for ethanol steam reforming to hydrogen production. The Ni0.5Cu0.1Mg2.4Al catalyst with Cu/Ni ratio of 0.2 revealed the higher activity and stability. This improved performance was closely related to small nickel particles well dispersed on the catalyst surface.