Promotional effect of Pd addition on the catalytic activity of composite Pt-Pd/AlSBA-15–β\beta catalyst for enhanced n-heptane hydroisomerization

Hierarchical AlSBA-15–zeolite materials were utilized as a supports for preparing hydroisomerization catalysts. Detailed consideration was given to: (i) the effect of the zeolite type introduced into AlSBA-15–zeolite composites (where zeolite is β, mordenite or ZSM-5) as well as (ii) the promotion effect of Pd addition. The composites showed higher activity in isomerization as compared to Pt/AlSBA-15. The enhanced isomerization efficiency were explained by the appropriate metallic and acidic function as well as suitable transport properties. The modification of the hydrogenating function by Pd incorporation increases the hydroisomerization efficiency of Pt-Pd/AlSBA-15–β catalyst. Over bimetallic Pt-Pd/AlSBA-15–β, the high yields of isomers (68 wt%) with respect to 50 wt% for a control catalyst. The most promising Pt-Pd/AlSBA-15–β catalyst allows to improve research octane number from 0 to the 74 value

Hydroconversion of 1-methylnaphthalene over Pt/SBA-15 catalysts : effect of SBA-15 chemical composition and method of binder incorporation

The effect of the binder (boehmite, 20 wt.%) incorporation method and the chemical composition of the support (AlSBA-15, ZrSBA-15) on the physicochemical properties of Pt (2 wt.%) catalysts and on their activity in 1-methylnaphthalene hydroconversion was examined. The supports and catalysts were analyzed by N2-sorption, XRD, 29Si MAS NMR, 27Al MAS NMR, XRF, H2-chemisorption, Py-IR, NH3-TPD, and TEM. When the binder was added to SBA-15 before impregnation with the Pt precursor, and when AlSBA-15 was used as a support, better Pt dispersion was obtained on the catalyst surface, which resulted in the improvement of the catalyst's hydrogenation properties