On the other hand, NiO/Al2O3 catalyst has the precursor constituents
to produce nickel aluminate (NiAl2O4) spinel. NiAl2O4 is a
partially reverse spinel with nickel ions in octahedral sites and
aluminum ions in tetrahedral sites [7]. Due to its high melting
point, high activity and resistance to corrosion, nickel aluminate
has been used in various catalytic applications and high temperature
fuel cells. It is also proposed as a promising anode for aluminum
production [8,9].