Ni(post)/TiO2(SG) was obtained by adding TiO2 prepared by a sol-gel route to a 0.01 mmol•L -1 solution of Ni(NO3)2 in deionized water following a ratio of 1 g of support for 17 mL of aqueous nickel solution. After 24 h under stirring, the solvent was removed in vacuo on rotatory evaporator, and the resulting solid was dried at 120°C for 2 h, calcined at 500°C for 5 h in flowing air (heating ramp of 5°C/min), and finally reduced in hydrogen flow for 1 h at a temperature ranging from 500°C to 700°C, with a 5°C/min ramp.