CH4/CO2 dry reforming was carried out to make syn gas on the Ni/Al2O3 catalysts calcined at different
temperatures. The Ni/Al2O3 (850 o
C) catalyst gave good activity and stability whereas the Ni/Al2O3 (450o C)
catalyst showed lower activity and stability. The NiO/Al2O3 catalyst calcined at 850 o
C for 16 h (Ni/Al2O3 (850 o
C)) formed the spinel structure of nickel aluminate, which was confirmed by TPR. The carbon formation rate
on the Ni/Al2O3 (850 o
C) catalyst was very low till 20 h, and then steeply increased with reaction time without
decreasing the activity for CH4 reforming. The Ni/Al2O3 (450 o
C) catalyst showed high carbon formation rate
at the initial reaction time and then, the rate nearly stopped with continuous decreasing the activity for CH4
reforming. Even though the amount of carbon deposition on the Ni/Al2O3 (850 o
C) catalyst was higher than that
on the Ni/Al2O3 (450 o
C) catalyst, the activity for CH4 reforming was also high, which could be attributed to
the different type of the carbon formed on the catalyst surface