Preparation of Ni-WO3/ZrO2 solid acid catalyst and its catalytic performance for n-heptane hydroisomerization

A series of Ni-WO3/ZrO2 catalysts were prepared by impregnation method. Their crystal structure and acidity were determined by XRD, BET, NH3-TPD. The catalytic performance of the Ni-WO3/ZrO2 samples for the n-heptane isomerization under different conditions was studied. The results showed that the addition of Ni made the Ni-WO3/ZrO2 catalyst with only acid active sites becoming a bi-function catalyst of acid and metal active sites, which had a good catalytic performance for n-heptane hydroisomerization. Under the conditions of n(H2)/n(n-C7H16)=12, MHSV=3.52 h-1, m(Cat)=0.3 g, reaction temperature of 300°C, and with the 5%Ni-15%WO3/ZrO2 as catalyst, whose supporter was calcined at 800°C, the conversion of n-heptane isomerization and its selectivity to i-heptane could reach 39.96% and 94.79%, respectively.