NDLI: Ni-Co-Zn-Al Catalysts From Hydrotalcite-Like Precursors for Hydrogen Production by Ethanol Steam Reforming

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ramis, Gianguido Busca, Guido Montanari, Tania Sisani, Michele Costantino, Umberto
Copyright Year	2010
Abstract	A series of well crystallized Ni-Co-Zn-Al LDHs materials has been prepared by the urea hydrolysis method as precursors of mixed oxide catalysts for the Ethanol Steam Reforming (ESR) reaction. The calcination of the layered precursors gives rise to high surface area mixed oxides, mainly a mixture of rock-salt phase (NiO), wurtzite phase (ZnO) and spinel phase. Both precursors and mixed oxides have been throughtfully characterized and the steam reforming of ethanol has been investigated over the calcined catalysts in flow reactor and in-situ FT-IR experiments. The data here reported provide evidence of the good catalytic activity of Co-Zn-Al and Co-Ni-Zn-Al catalysts prepared from hydrotalcite-like LHD precursors for ethanol steam reforming. At 823 K the most active Co/Ni catalyst containains a predominant spinel phase with composition near Zn0.58Ni0.42[Al0.44Co0.56]2O4 and small amounts of NiO and ZnO. On the other side, at 873 K the selectivity to hydrogen increases with cobalt content. In particular, the presence of cobalt increases selectivity to H2 and CO2 and decreases selectivity to methane in the low temperature range 720–870 K. The most selective catalyst is the Ni-free Co-Zn-Al mixed oxide essentially constituted by a single spinel type phase Zn0.55Co0.45[Al0.45Co0.55]2O4. Cobalt catalysts appear consequently to behave better than nickel based catalysts in this temperature range. The key feature for high selectivity to hydrogen is proposed to be associated to a stability of a relatively high oxidation state at the catalyst surface, the most relevant selectivity determining step being constituted by the evolution of surface acetate species. In fact, over oxidized catalyst surface the acetate species evolve producing carbon dioxide and hydrogen while over a more reduced surface they evolve giving rise to methane and COx. Water is supposed to have the main role of allowing surface sites to stay in an unreduced state at least in the temperature range 720–870 K.
Sponsorship	Advanced Energy Systems Division
Starting Page	649
Ending Page	654
Page Count	6
File Format	PDF
ISBN	9780791844052
DOI	10.1115/FuelCell2010-33034
e-ISBN	9780791838754
Volume Number	ASME 2010 8th International Fuel Cell Science, Engineering and Technology Conference: Volume 2
Conference Proceedings	ASME 2010 8th International Conference on Fuel Cell Science, Engineering and Technology
Language	English
Publisher Date	2010-06-14
Publisher Place	Brooklyn, New York, USA
Access Restriction	Subscribed
Subject Keyword	Methane Water Temperature Stability Catalysts Ethanol Hydrogen Carbon dioxide Cobalt Flow (dynamics) Rocks Steam reforming Nickel Oxidation Hydrogen production Low temperature
Content Type	Text
Resource Type	Article

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