superacid catalyst for hydroisomerization of n-paraffins.

摘要

superacid catalyst having a porosity ranging from 0, 1 to 0, 30 cm3 / g, consisting of at least 70% of pores with a diameter ranging from 1 to 4 nm, comprising zirconium oxide is formed crystallites of pure tetragonal phase with dimension less than 300 Angstrom, wherein the surface of zirconia sulfate groups thereon in a quantity corresponding to total coverage of the surface of zirconium oxide by a monolayer of said groups sulphate, optionally containing a noble metal in an amount ranging from 0, 1 to 3% by weight, obtained by a process comprising: (a) hydrolyzing in a basic environment with stirring for a few hours, a hydrolyzable derivative zirconium hydroxide in the presence of a tetraalkylammonium (TAA) and acetylacetone (AcAc); (B) treating the hydrolyzate of step (a) with sulfuric acid, the remaining basic medium; (C) drying and calcining the resulting product at a temperature ranging from 650 ° C to 250; (D) optionally treating the product resulting from step (c) with an aqueous solution of a compound of a noble metal, drying and calcining.