. Glycerol steam reforming over Ni/ɣ-Al2O3 catalysts, modified with Mg(II). Effect of Mg (II) content

M. L. DIEUZEIDE; M. JOBBAGY; AMADEO NORMA

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2014 p. 16976 - 16982

0360-3199

The aim of the present work is to analyse the effect of the Ni(II) content for the Ni(II)-Mg(II)/g-Al2O3 catalysts on the textural and structural characteristics of the solid, as well on thecatalytic activity and selectivity to H2 for the steam reforming of glycerol at atmosphericpressure.The samples with different contents of Ni(II) were characterized by different techniquesincluding: N2 sorptometry, PXRD, H2 chemisorption, elemental analysis by inductivelycoupled plasma atomic emission spectroscopy (ICP-AES) and temperature programmedreduction (TPR). The catalytic activity of the samples was tested in the steam reforming ofglycerol.It was concluded that the Ni(II) species present on the catalysts are strongly dependenton Ni(II) loading. As Ni(II) content increases NiO nanocrystals are formed; the Ni(0) sitesobtained from the reduction of these nanocrystals are responsible for the catalytic activity.On the other hand, at high Ni(II) contents the NiO nanocrystal size increases and as aconsequence de intrinsic catalytic activity decreases.