This study includes two parts. In the first part, the nanocatalysts of Au@SiO 2 and Au/SiO 2 have been prepared using sol-gel technique. Then, using some techniques such as FT-IR, XRD, FESEM, TEM, ICP, BET and TGA, they were investigated in terms of structure and morphology. XRD technique proves the formation of amorphous silica.TEM images show the formation of gold nanoparticles with proper distribution and the average particle size of 15 nm. BET-surface area technique represents a complex of micro-meso pores in the structure.Then, the prepared catalyst has been used in cyclohexane oxidation reaction using molecular oxygen to produce adipic acid. In the following, various factors affecting production efficiency and selectivity of the adipic acid such as temperature, time, pressure of oxygen and catalytic amount have been investigated. Moreover, the reusability of the catalyst in optimal conditions investigated for six runs. Finally, the conversion efficiency of 26% and selectivity of 92% have been obtained for adipic acid. In the second part, g-C 3 N 4 -rGO composite was used to stabilize palladium nanoparticles. To verify synthesis of 4%Pd/g-C 3 N 4 -rGO nanocatalyst, FT-IR, ICP, XRD, TGA, FESEM and TEM techniques were used.These nanocatalysts were used to in order to oxidize ethylbenzene and produce acetophenone as the main reaction product in the presence of tert-Butyl hydroperoxide. Some factors including time, temperature, amount of nanocatalyst, amount of metal, type and amount of oxidant and solvent were optimized for this reaction. Furthermore, performing the reaction in optimal conditions for several run has been investigated for this catalyst. Finally, acetophenone with conversion efficiency of 67% and selectivity of 97% was achieved.