The focus of this research was investigation of the changes occurred in Alumina structure doped by introducing Nickel Oxide into the lattice of Alumina under air and nitrogen atmosphere. The catalysis was prepared by sol-gel method from precursors including Nickel chloride (II) with weight percentage of 5, 25, 50, 75, and 100 and aluminum iso peroxide. Structures were studied by XRD, BET, FT-IR and SEM. Results illustrated that the changes in temperature and atmosphere had noticeable effects on catalytic matrix, consequently on dehydration of 2-octanol and 1,2-di phenyl 2- propanol(DPP) alcohols. XRD spectra of calcinated samples at temperature range of 350 ?C showed that the amorph Al 2 O 3 at 600 ?C phases, NiO and NiAl 2 O 4 which were characterized by BET showed that catalysis containing more percent of Nickel has smaller outer-specific surface area. The penetrating of NiO atoms into Alumina lattice fills pores of alumina surface and saturates the pores which lead to severe decreases in surface area of catalyst. The air and nitrogen atmosphere influences the outer specific of the catalysis. It was shown that nitrogen atmosphere prevented a severe decrease of the catalysis specific surface in comparison with air atmosphere. Finally, we investigated the properties of these catalysts. The elimination reaction of and 2-octanol,and discussed the reactivity selectivity of catalysis. The comparison of results of Ni doped catalyst with pure alumina showed that increasing the amount of Ni alumina lattice increases the interaction with more alcohol. Actually, this interaction was more pronounced for DPP which caused and more adsorption of the surface complete dehydration.But on the contrary, selectivity was reduced.dehydration of 2-octanol alcohol in air atmosphere showed that with increase the nickel amount a decrease in conversion was observed for 2-octanol alcohol.This was not the case at nitrogen atmosphere. The best catalysis for the complete dehydration of 2-octanol is 5 and 10 % nickel mixed oxide.
