INVESTIGADORES
AMADEO Norma Elvira
artículos
Título:
Glycerol steam reforming over Ni/Al2O3 catalyst, modified with Mg (II). Effect of Mg (II) content
Autor/es:
MARIA L DIEUZEIDE; MATÍAS JOBBÁGY; NORMA AMADEO
Revista:
CATALYSIS TODAY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2013 vol. 213 p. 50 - 57
ISSN:
0920-5861
Resumen:
Ni based catalysts supported over -Al2O3, previously modified with increasing contents of Mg(II), were
employed for the steam reforming of glycerol. The aim of the present study is to analyze the effect of the
content of Mg(II), as a promoter of Ni/-Al2O3 catalysts, on the textural and structural characteristics of
the solid; as well as on the catalytic activity and selectivity to H2 in the steam reforming of glycerol.
Fresh samples were characterized by PXRD, BET surface area, H2 chemisorption, TPR, and CO2-TPD.
Used catalysts were analyzed by TPO, in order to study the effect of Mg(II) on carbon gasification. Both
fresh and used samples were examined by SEM.
The content of Mg(II) has both an effect on the catalytic performance and on the structural and textural
characteristics of the catalysts. The incorporation of Mg(II) results in the formation of Mg1−xAl2O4−x
spinel phase. The differences in catalytic properties due to the increasing content of Mg(II) have effect
simultaneously on the Ni◦ crystallite size, on the acidicbasic character and on the interactions between
NiO and support. For the catalysts promoted with Mg(II), the best activity for the steam reforming of
glycerol was achieved with Ni(10)Mg(3)Al catalyst while the Ni(10)Mg(15)Al catalyst formed the lowest
amount of carbon during reaction time on stream.
The catalyst prepared without Mg(II) presented good activity results despite the lowest Ni dispersion.
This behaviour was assigned to the presence of Ni sites more active for the steam reforming of glycerol
than the ones on the catalyst promoted with Mg(II). However, this catalyst had the highest carbon
deposition during reaction time on stream.
High contents of Mg(II) inhibited carbon formation, this was evidenced by TPO analyses performed to
used samples. Low carbon formation at high Mg(II) could be related to the higher basic character of the
support as the content of Mg(II) increases.