2.4. Nanocatalysts preparation and procedures
Fig. 5 shows the employed impregnation method for preparation of Ni-based nanocatalysts. Firstly, the Ni solution was prepared using nickel nitrate (Ni (No3)3•6H2O) dissolved in deionized water. Then, the resulted aqueous solution and specified support were mixed and heated for 5 h at 60 °C. The resulted solution was dried under air flow at 110 °C for 24 h and then all nanocatalysts calcined at 550 °C for 4 h.