Ethanol steam reforming over Ni/La–Al2O3 catalysts: Influence of lanthanum loading

Abstract Hydrogen production from ethanol reforming over nickel catalysts supported on lanthanum loaded Al 2 O 3 substrates was studied. Activity results revealed the enhancement in the reforming stability of the Ni catalysts with the increase in the lanthanum loading on Al 2 O 3 substrates. Catalytic behavior of Ni/La–Al 2 O 3 catalysts in the ethanol steam reforming was found to be the contribution of the activity of the La–Al 2 O 3 supports for the ethanol dehydration reaction and the activity of the nickel metallic phase that catalyzes both dehydrogenation and C C bond rupture. Physicochemical characterization of catalysts revealed that acidity, nickel dispersion and nickel-support interaction depend on the La-loading on Al 2 O 3 . The better reforming stability of catalysts with the increase in La content was explained in terms of the ability of nickel surface and/or La–Ni interactions to prevent the formation of carbon filaments.

[1]  J. A. Wang,et al.  Effects of structural defects and acid–basic properties on the activity and selectivity of isopropanol decomposition on nanocrystallite sol–gel alumina catalyst , 1999 .

[2]  T. Hatsui,et al.  Structures and Acid−Base Properties of La/Al2O3 Role of La Addition to Enhance Thermal Stability of γ-Al2O3 , 2003 .

[3]  Willes H. Weber,et al.  Dispersion studies on the system La2O3γ-Al2O3 , 1989 .

[4]  E. Assaf,et al.  High efficiency steam reforming of ethanol by cobalt-based catalysts , 2004 .

[5]  Rufino M. Navarro,et al.  Production of hydrogen by oxidative reforming of ethanol over Pt catalysts supported on Al2O3 modified with Ce and La , 2005 .

[6]  J. N. Russell,et al.  Bond activation sequence observed in the chemisorption and surface reaction of ethanol on Ni(111) , 1986 .

[7]  Xenophon E. Verykios,et al.  Reaction network of steam reforming of ethanol over Ni-based catalysts , 2004 .

[8]  M. Laborde,et al.  Bio-ethanol steam reforming on Ni/Al2O3 catalyst , 2004 .

[9]  E. Iglesia,et al.  Structure and Surface and Catalytic Properties of Mg-Al Basic Oxides , 1998 .

[10]  Heather M. Coleman,et al.  Metal-catalysed steam reforming of ethanol in the production of hydrogen for fuel cell applications , 2002 .

[11]  X. Verykios,et al.  Production of hydrogen for fuel cells by reformation of biomass-derived ethanol , 2002 .

[12]  A. Proctor,et al.  Influence of lanthanum on the surface structure and CO hydrogenation activity of supported cobalt catalysts , 1989 .

[13]  Xenophon E. Verykios,et al.  Production of hydrogen for fuel cells by steam reforming of ethanol over supported noble metal catalysts , 2003 .

[14]  L. Haack,et al.  Characterization of lanthanum-modified γ-alumina by X-ray photoelectron spectroscopy and carbon dioxide absorption , 1992 .

[15]  Pilar Ramírez de la Piscina,et al.  Efficient Production of Hydrogen over Supported Cobalt Catalysts from Ethanol Steam Reforming , 2002 .

[16]  J. Moulijn,et al.  Temperature-programmed reduction of NiOWO3/Al2O3 Hydrodesulphurization catalysts , 1989 .

[17]  M. Twigg,et al.  Reduction of impregnated NiO/α-A12O3 association of A13+ ions with NiO , 1998 .

[18]  Y. Liu,et al.  High temperature thermal stabilization of alumina modified by lanthanum species , 2001 .

[19]  Umit S. Ozkan,et al.  Deactivation characteristics of lanthanide-promoted sol–gel Ni/Al2O3 catalysts in propane steam reforming , 2005 .

[20]  J. Nørskov,et al.  Ethylene dissociation on flat and stepped Ni(111): A combined STM and DFT study , 2006 .