m s ale, CSI

ty o ina d in niq rosc hat It was observed that heat treatment of 15 h milled sample at 1100 C is enough to produce nickel alumi-nate spinel. A product of direct mechanical milling showed higher value of surface area (42.3 m2/g) and st is an cesses onditio g and eactiv On the other hand, NiO/Al2O3 catalyst has the precursor constit-uents 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 processes accompanying repeated fracture, welding, and deforma-tion of particles during collision events [16]. Also, reactivity of the milled powders can be enhanced by mechanical activation and hence, the temperature in subsequent heat treatment steps will be reduced [17]. In a previous work by Han et al. [18], effect of ex-cess NiO on the synthesis of NiAl2O4 through solid state reaction was investigated. They found that the milling time and starting materials had an important effect on the excess of NiO