Preparation of NiO/MgxSi1-xOy Catalysts and Their Application in Catalytic Cracking of Tar Components in Hot Coke Oven Gas

NiO/MgxSi1-xOy, catalysts were prepared by incipient wetness impregnation with MgxSi1-xOy supports synthesized by the sol-gel method. These catalysts were characterized by Brunauer-Emmett-TeHer (BET), X-ray diffraction (XRD) and transmission electron microscope (TEM). The catalytic activity of NiO/MgxSi1-xOy catalysts was evaluated in a fixed-bed reactor via the catalytic cracking of toluene and naphthalene as model tar compounds in hot coke oven gas (COG). The results showed that the calcination temperature of the catalysts, reaction space velocity and Mg/Si atomic ratio greatly influenced the reaction activity of the catalysts. 10%(w) NiO/Mg0.80Si0.20Oy could fully convert toluene and naphthalene into light fuel gases such as CO and CH4, showing good catalytic activity, stability and resistance to coke deposition.