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Support effects on Ru–HPA bifunctional catalysts: Surface characterization and catalytic performance

Paper ID Volume ID Publish Year Pages File Format Full-Text
43907 45994 2007 9 PDF Available
Title
Support effects on Ru–HPA bifunctional catalysts: Surface characterization and catalytic performance
Abstract

The behaviour of three metal–acid bifunctional catalysts, where the metal was Ru and the acid function was a heteropolyacid (HPA), was compared in the hydroconversion of n-hexane. Both the activity and the selectivity pattern depended on the used support: silica, high surface area graphite (HSAG) or zeolite KL. While Ru–HPA–SiO2 gave selectivity to isomerization products of 97%, the Ru–HPA–KL sample gave a selectivity of 96% to hydrogenolysis products. And, the performance of Ru–HPA–HSAG lied between that for Ru–HPA–SiO2 and Ru–HPA–KL, giving both isomerization and hydrogenolysis products, with selectivities of 45 and 54%, respectively. The series of techniques applied to characterize the catalysts have assisted in understanding the catalytic performance. The HPA phase has been detected over all the HPA-modified supports, but different acid sites strength distributions have been determined by calorimetry of NH3 adsorption, following the order HPA–SiO2 > HPA–HSAG > HPA–KL. Also, different Ru species have been observed on the catalysts surface due to the interaction between the Ru precursor and the HPA support. Finally, the analysis of the results has suggested that the support determines the role played by both metal and acid functions, which separately would lead to hydrogenolysis and isomerization reactions, respectively.

Graphical abstractThe behaviour of three metal–acid bifunctional catalysts, where the metal was Ru and the acid function was a heteropolyacid (HPA), was compared in the hydroconversion of n-hexane. Both the activity and the selectivity pattern depended on the used support: silica, high surface area graphite (HSAG) or zeolite KL. The series of techniques applied to characterize the catalysts have shown that the selection of the support affects the acid sites strength distributions as well as the interaction between the Ru precursor and the HPA support. Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Heteropolyacid; Bifunctional catalysts; n-Hexane hydroconversion
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Support effects on Ru–HPA bifunctional catalysts: Surface characterization and catalytic performance
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 333, Issue 2, 15 December 2007, Pages 281–289
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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