Pt/BEA–Al2O3 Catalysts for Hydroisomerization of Benzene-Heptane Mixture: II. Precursors and Platinum Content

Abstract

Pt/BEA–Al₂O₃ catalysts were prepared from two type precursors (H₂PtCl₆ and [Pt(NH₃)₄]Cl₂); the platinum content was varied between 0.02 and 0.5 wt %. The catalyst testing for hydroisomerization of a benzene-heptane mixture at 1.5 MPa and 230–330 °C demonstrated high selectivities to methylcyclopentane of the catalysts containing 0.2–0.5 wt % of platinum prepared both from acid and from ammiacate. The selectivity depended on the conversion but not on the platinum content. A higher selectivity of heptanes isomerization was observed with the catalysts prepared by supporting platinum from the H₂PtCl₆ solution. The catalysts can be used for hydroisomerization of benzene- containing gasoline fractions in order to decrease the content of aromatic hydrocarbons in commercial motor gasoline.