2.1.2. Impregnation Method

A total of 5 g of TiO2 (P25 Evonik) was dispersed in 100 mL of distilled water containing the required amount of NiCl2 (Sigma Aldrich) aqueous solution in order to have a nickel nominal content of 0.5% by weight. The suspension was stirred for 1 h and then vacuum filtered at 100 ◦C. Then, the solid was dried overnight (100 ◦C) and calcined at 400 ◦C for 6 h (ramp rate 10 ◦C·min−1).

The catalyst nomenclature includes the metal (Ni), the nominal content (0.5% by weight) and a su ffix indicating the synthetic method (DP or IMP for deposition–precipitation or impregnation, respectively).
