Promotional Effect of Pd Addition on the Catalytic Activity of Composite Pt-Pd/AlSBA-15-β 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 beta, 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-beta catalyst. Over bimetallic Pt-Pd/AlSBA-15-beta, the high yields of isomers (68 wt%) with respect to 50 wt% for a control catalyst. The most promising Pt-Pd/AlSBA-15-beta catalyst allows to improve research octane number from 0 to the 74 value.

Automated summary

In this study, hierarchical AlSBA-15-zeolite materials were used as supports for hydroisomerization catalysts, with a focus on the effect of zeolite type and Pd addition. The Pt-Pd/AlSBA-15-β catalyst showed higher isomerization efficiency, leading to improved research octane number.