Abstract:

TiO2-Al2O3 catalyst support was prepared by the sol-gel method and NiO/WO3/TiO2-Al2O3 catalyst was prepared by stepwise impregnation. Hydroisomerization of n-heptane over the NiO/WO3/TiO2-Al2O3 catalyst was investigated in a continuous flow fixed-bed reactor under atmospheric pressure. The catalysts were characterized using XRD and BET surface area. The effects of WO3 content, Ni content, calcination temperature, reduction temperature, reaction temperature on the catalytic performance were studied systematically. The result showed that when the mass fraction of WO3 and Ni in the catalyst was 25% and 10%, respectively, the highest catalytic activity of NiO/WO3/TiO2-Al2O3 could be achieved. The conversion of n-heptane is 15.50% while the isomerization selectivity of i-heptane can reach 84.06%.

Key words: NiO/WO3/TiO2-Al2O3, catalyst, n-heptane, hydroisomerization