Abstract: According to the reaction mechanism of n-paraffin hydroisomerization, a new hydroisomerization catalyst was developed for the isomerization of linear alkanes. The catalyst used a special acidic component to promote the reaction molecules to approach the reaction active site and the isomerization of intermediate products to quickly detach from the reaction active site. The results of physical and chemical properties characterization revealed that the new molecular sieves and catalysts had larger pore volume, larger pore diameter and weaker acidity than the contrast molecular sieves and catalysts. The results of the evaluation experiments using two types of industrial hydrocracking tale oil and F-T wax as the feeds showed that using new catalyst could get higher target product yield and less loss of viscosity index than the contrast catalyst, and it could adapt to different raw feed oil. Specially, the activity and isomerization selectivity of the new catalyst were higher when F-T wax was the feed.

Key words: n-alkane, hydroisomerization, catalyst, pour point, viscosity index