Ni (II) Mg (II) Al (III) catalyst for hydrogen production from etanol steam reforming: Influence of activation treatment

A. ROMERO; M. JOBBAGY; M.A. LABORDE; G. BARONETTI; N. AMADEO

CATALYSIS TODAY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2010 vol. 149 p. 407 - 412

0920-5861

The effect of the Ni(II)?Mg(II)?Al(III) layered double hydroxide (LDH) activation conditions over the surface and bulk composition and the catalytic performance in ethanol steam reforming (ESR) is studied. Ternary oxides were prepared by thermal decomposition of LDHs synthesized using the homogeneous precipitation method with urea. Catalyst precursor is submitted to two different activation treatments: calcinations at 400, 500, 600 and 700 ºC with subsequent reduction at 720 ºC, or direct reduction at 720ºC. The samples were characterized by sorptometry, H2 chemisorption, ICP chemical analysis, thermogravimetric analysis, X-ray diffraction, X-ray photoelectronic spectroscopy and temperature programming reduction. The catalysts obtained by calcination at 600 ºC and then reduction at 720 ºC and those directly reduced at 720 ºC showed the better performance in ESR. The precursor submitted to a proper thermal treatment develops, through a decoration-demixing process, a Ni(II)-poor spinel-type shell onto NiO domains.