Fig. 11 presents the molar fractions and conversion of the
components of the gas products from the reactor during the 10 h
reaction-on-stream for the 15% and 30% Ni/Al2O3 catalysts. Both
reactions remained stable during the 10 h of reaction, which
indicated no significant loss of catalytic activity during the process.
This stability can be attributed to the lower strength of the active
sites, and to the presence of the NiAl2O4 phase, which indicates the
high metal/support interaction, hindering metal sintering