Zusammenfassung
Nanostructured Ni-containing spinel oxide catalysts were obtained using
a nanocasting method. Analyses by XRD, TEM, TPD-CO2 and TPR showed that
Ni degrees and/or Co degrees entities with high accessibility to CH4 and
CO2 were responsible for high catalytic performance in the dry reforming
of methane. The NiCo (Co degrees and Ni degrees dispersed on NiAl2O4)
and NiAl (Ni degrees dispersed on NiAl2O4) species were highly active
for CH4 conversion, whereas Ni degrees dispersed on either Fe3O4-Co3O4
or CeO2-NiAl2O4 provided a lower catalytic performance due to active
phase degradation. The higher activity exhibited by NiAl compared to
NiCo was related to the higher activity of nickel for CO2 decomposition,
while its remarkable stability seemed to be due to the presence of well
dispersed nanoparticles involved in long-term conversion because they
produced non-deactivating carbon deposits, as suggested by Raman
analyses. Copyright (C) 2011, Hydrogen Energy Publications, LLC.
Published by Elsevier Ltd. All rights reserved.
Nutzer