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The nanoparticles of NiO supported on mesoporous MCM-41 were synthesized and characterized with X-ray diffraction (XRD) and transmission electron microscopy (TEM). In this study, catalytic activities of the supported NiO nanoparticles for oxidation of cyclohexene to 2-cyclohexene-1-ol and 2-cyclohexene-1one with air in the gas phase were considered. These nanoparticles of NiO supported on mesoporous MCM-41 were effective catalysts in a temperature range of 220-310 • C at 1 atm of air. Under these reaction conditions, the activity of the catalysts decreases in the following order: 5 wt.% NiO/MCM-41 > 7.5 wt.% NiO/MCM-41 > 2.5 wt.% NiO/MCM-41. With 5 wt.% NiO supported on mesoporous MCM-41 and under our experimental conditions, the conversion percent of cyclohexene is 62.3% with 65.9% selectivity of 2-cyclohexene-1-ol + 2-cyclohexene-1-one and 12.2% cyclohexadiene at 280 • C. To achieve higher conversion of cyclohexene and better selectivity towards 2-cyclohexene-1-ol + 2-cyclohexene-1-one, factors such as reaction temperature, loading amount of nickel oxide and space velocity were studied, and optimized conditions were investigated.

A novel magnetic supported dicationic ionic liquid namely Fe 3 O 4 @SiO 2 ⋅DIL has been prepared, and characterized by various analysis methods such as FT-IR, TEM, SEM, XRD, EDX, EDX mapping, and TGA. Afterward, catalytic activity of the Fe 3 O 4 @SiO 2 ⋅DIL has been examined in alcohols oxidation reaction. The resulting new nanocomposite as a heterogeneous catalyst displayed remarkable activity for the oxidation of various alcohols using H 2 O 2 under mild reaction conditions. Eventually, the as-prepared Fe 3 O 4 @SiO 2 ⋅DIL catalyst was also stable and reused at least five times without losing its catalytic activity and selectivity. Magnetic recoverability of the catalyst, high yields, good compliance with green chemistry protocols and economical are some advantages of the work.

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